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Case Study and Passage Based Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Here, we have provided case based/passage based questions for Class 10 Science Chapter 1 Chemical Reactions and Equations.

Case Study/Passage Based Questions on Chemical Reactions and Equations

Case Study/Passage Based Questions

Question 1:

Corrosion is the phenomenon of deterioration of surface of metal in presence of air and moisture. It is a natural process and in the presence of a moist atmosphere, chemically active metals get corroded. This is an oxidation reaction. Rusting is the process where iron corrodes due to exposure to the atmosphere. The main circumstance of corrosion occurs with iron because it is a structural material in construction, bridges, buildings, rail transport, ships, etc. Aluminium is also an important structural metal, but even aluminium undergoes oxidation reactions. However, aluminium doesn’t corrode or oxidize as rapidly as its reactivity suggests. Copper (Cu) corrodes and forms a basic green carbonate.

(i) What is rusting?

(ii) Which two metals do not corrode easily?

(iii) Write the chemical name of the compound formed on corrosion of silver.

(iv) Corrosion is (a) a redox reaction (b) a reduction reaction (c) a displacement reaction (d) an oxidation reaction

Also read: Assertion Reason Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Question 2:

Oxidation is the process of gaining of oxygen, or losing of hydrogen. Reduction is the process of losing of oxygen or gaining of hydrogen. The substance which undergoes oxidation is the reducing agent while the substance which undergoes reduction is known as the oxidising agent. Oxidation and reduction always take place together and these type of reactions are known as redox reactions. Some of the examples of redox reactions are given below:

(i) Give two examples of oxidation reaction from your everyday life.

(ii) Write the oxidising agent in the reaction III and VI.

(iii) Which of the following is an oxidising agent? (a) LiAlH 4 (b) Alkaline KMnO 4 (c) Acidified K 2 Cr 2 O 7 (d) Both (b) and (c)

(iv) Out of oxidation and reduction, which reaction takes place at anode?

Also read: Extra Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Question 3:

A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination, decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.

(i) The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as (a) thermal decomposition reaction (b) photo decomposition reaction (c) electric decomposition reaction (d) both (a) and (c)

(ii) The massive force that pushes the rocket forward through space is generated due to the (a) combination reaction (b) decomposition reaction (c) displacement reaction (d) double displacement reaction

(iii) A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of (a) lead nitrate (b) nitrogen oxide (c) lead oxide (d) oxygen gas

(iv) Which of the following reactions represents a combination reaction? (a) CaO (s) + H 2 O (l) → Ca(OH) 2 (aq) (b) CaCO 3 (s) → CaO (s) + CO 2 (g) (c) Zn(s) + CuSO 4 (aq) → ZnSO 4 (aq) + Cu(s) (d) 2FeSO 4 (s) → Fe 2 O 3 (s) +SO 2 (g) + SO 3 (g)

(v) Complete the following statements by choosing correct type of reaction for X and Y. Statement 1: The heating of lead nitrate is an example of ‘X’ reaction. Statement 2: The burning of magnesium is an example of ‘Y’ reaction. (a) X- Combination, Y- Decomposition (b) X- Decomposition, Y-Combination (c) X- Combination, Y-Displacement (d) X- Displacement, Y-Decomposition

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3 thoughts on “ Case Study and Passage Based Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations ”

Good examples! But can you please available practical types and equations type of case based questions which we can read and learn an then they help us to solve the Boards examm. Pleaseeww🙂🙂🙂

would love to see more equation based questions. nevertheless, it proved quite useful in my revision!

after going through the above content child should develops ideas to answer based on knowledge acquired.

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CBSE NCERT Solutions

NCERT and CBSE Solutions for free

Case Study Chapter 1 Chemical Reactions and Equations

Please refer to Chapter 1 Chemical Reactions and Equations Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 1 Chemical Reactions and Equations

Case/Passage – 1 The reaction between MnO 2  with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released .

Question: Identify the correct statement from the following: (a) MnO2 is getting reduced whereas HCl is getting oxidized (b) MnO2 is getting oxidized whereas HCl is getting reduced. (c) MnO2 and HCl both are getting reduced. (d) MnO2 and HCl both are getting oxidized.   

Question: Chlorine gas reacts with _____ to form bleaching powder. (a) dry Ca(OH) 2 (b) dil. solution of Ca(OH) 2 (c) conc. solution of Ca(OH) 2 (d) dry CaO   

Question: In the above discussed reaction, what is the nature of MnO2? (a) Acidic oxide (b) Basic oxide (c) Neutral oxide (d) Amphoteric oxide   

Question: The chemical reaction between MnO2 and HCl is an example of: (a) displacement reaction (b) combination reaction (c) redox reaction (d) decomposition reaction. 

Question: What will happen if we take dry HCl gas instead of aqueous solution of HCl? (a) Reaction will occur faster. (b) Reaction will not occur. (c) Reaction rate will be slow. (d) Reaction rate will remain the same. 

Case/Passage – 2

Chemistry in Automobiles: For an internal combustion engine to move a vehicle down the road, it must convert the energy stored in the fuel into mechanical energy to drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical “spark”, which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustionof gasoline in full supply of air: 2C 8 H 18 (I) + 25O 2 (g) → 16 ‘X’ + Y Question: Which of the following are the products obtained from the reaction mentioned in the above case?  Product ‘       X’ Product ‘Y’ (a) CO 2             H 2 O 2 (b) H 2 O           CO (c) CH 3 OH       H 2 O (d) CO 2              H 2 O 

Question: On the basis of evolution/absorption of energy, which of the following processes are similar to combustion of fuel? (i) Photosynthesis in plants (ii) Respiration in the human body (iii) Decomposition of vegetable matter (iv) Decomposition of ferrous sulphate. (a) (ii) & (iii) (b) (i) & (ii)    (c) (iii) & (iv) (d) (ii) & (i)

Question: ‘Although nitrogen is the most abundant gas in the atmosphere, it does not take part in combustion’. Identify the correct reason for this statement. (a) Nitrogen is a reactive gas (b) Nitrogen is an inert gas (c) Nitrogen is an explosive gas (d) Only hydrocarbons can take part in combustion 

Question: Identify the types of chemical reaction occurring during the combustion of fuel: (a) Oxidation & Endothermic reaction (b) Decomposition & Exothermic reaction (c) Oxidation & Exothermic reaction (d) Combination & Endothermic reaction 

Question: ‘A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road.’ Choose the correct reason for the production of black smoke: (a) Limited supply of air leads to incomplete combustion of  fuel. (b) Rich supply of air leads to complete combustion of fuel. (c) Rich supply of air leads to a combination reaction. (d) Limited supply of air leads to complete combustion of fuel. 

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Case Study Class 10 Science Questions and Answers (Download PDF)

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Case Study Class 10 Science

If you are looking for the CBSE Case Study class 10 Science in PDF, then you are in the right place. CBSE 10th Class Case Study for the Science Subject is available here on this website. These Case studies can help the students to solve the different types of questions that are based on the case study or passage.

CBSE Board will be asking case study questions based on Science subjects in the upcoming board exams. Thus, it becomes an essential resource to study. 

The Case Study Class 10 Science Questions cover a wide range of chapters from the subject. Students willing to score good marks in their board exams can use it to practice questions during the exam preparation. The questions are highly interactive and it allows students to use their thoughts and skills to solve the given Case study questions.

Download Class 10 Science Case Study Questions and Answers PDF (Passage Based)

Download links of class 10 Science Case Study questions and answers pdf is given on this website. Students can download them for free of cost because it is going to help them to practice a variety of questions from the exam perspective.

Case Study questions class 10 Science include all chapters wise questions. A few passages are given in the case study PDF of Science. Students can download them to read and solve the relevant questions that are given in the passage.

Students are advised to access Case Study questions class 10 Science CBSE chapter wise PDF and learn how to easily solve questions. For gaining the basic knowledge students can refer to the NCERT Class 10th Textbooks. After gaining the basic information students can easily solve the Case Study class 10 Science questions.

Case Study Questions Class 10 Science Chapter 1 Chemical Reactions & Equations

Case Study Questions Class 10 Science Chapter 2 Acids, Bases & Salts

Case Study Questions Class 10 Science Chapter 3 Metals & Non-metals

Case Study Questions Class 10 Science Chapter 4 Carbon & Its Compounds

Case Study Questions Class 10 Science Chapter 5 Periodic Classification of Elements

Case Study Questions Class 10 Science Chapter 6 Life Processes

Case Study Questions Class 10 Science Chapter 8 How Do Organisms Reproduce

Case Study Questions Class 10 Science Chapter 9 Heredity & Evolution

Case Study Questions Class 10 Science Chapter 10 Light-Reflection & Refraction

Case Study Questions Class 10 Science Chapter 11 The Human Eye & the Colourful World

Case Study Questions Class 10 Science Chapter 12 Electricity

Case Study Questions Class 10 Science Chapter 13 Magnetic Effects of Electric Current

Case Study Questions Class 10 Science Chapter 15 Our Environment

How to Solve Case Study Based Questions Class 10 Science?

In order to solve the Case Study Based Questions Class 10 Science students are needed to observe or analyse the given information or data. Students willing to solve Case Study Based Questions are required to read the passage carefully and then solve them. 

While solving the class 10 Science Case Study questions, the ideal way is to highlight the key information or given data. Because, later it will ease them to write the final answers. 

Case Study class 10 Science consists of 4 to 5 questions that should be answered in MCQ manner. While answering the MCQs of Case Study, students are required to read the paragraph as they can get some clue in between related to the topics discussed.

Also, before solving the Case study type questions it is ideal to use the CBSE Syllabus to brush up the previous learnings.

Features Of Class 10 Science Case Study Questions And Answers Pdf

Students referring to the Class 10 Science Case Study Questions And Answers Pdf from Selfstudys will find these features:-

• Accurate answers of all the Case-based questions given in the PDF.
• Case Study class 10 Science solutions are prepared by subject experts referring to the CBSE Syllabus of class 10.
• Free to download in Portable Document Format (PDF) so that students can study without having access to the internet.

Benefits of Using CBSE Class 10 Science Case Study Questions and Answers

Since, CBSE Class 10 Science Case Study Questions and Answers are prepared by our Science experts referring to the CBSE Class 10 Science Syllabus , it provided benefits in various way:-

• Case study class 10 Science helps in exam preparation since, CBSE Class 10 Question Papers contain case-based questions.
• It allows students to utilise their learning to solve real life problems.
• Solving case study questions class 10 Science helps students in developing their observation skills.
• Those students who solve Case Study Class 10 Science on a regular basis become extremely good at answering normal formula based Science questions.
• By using class 10 Science Case Study questions and answers pdf, students focus more on Selfstudys instead of wasting their valuable time.
• With the help of given solutions students learn to solve all Case Study questions class 10 Science CBSE chapter wise pdf regardless of its difficulty level.

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Class 10 Science Case Study Questions PDF Download

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Are you searching for a comprehensive resource to improve your understanding and problem-solving skills in Class 10 Science? Look no further! In this article, we will explore the world of Class 10 Science case study questions and provide you with an opportunity to download a PDF resource containing a collection of case study questions designed specifically for this subject. Let’s dive in and enhance your knowledge!

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Table of Contents

CBSE Class 10th – SCIENCE: Chapterwise Case Study Question & Solution

Case study questions provide a practical and real-life context for applying scientific concepts and principles. These questions require you to analyze a given scenario, identify relevant information, and utilize your scientific knowledge to solve problems or draw conclusions. Case study questions assess your ability to think critically, make connections, and apply scientific principles in a practical setting.

Chapterwise Case Study Questions for Class 10 Science

To support your preparation for Class 10 Science examinations, we have created a comprehensive PDF resource containing a collection of case study questions designed specifically for this subject. This PDF includes a variety of case studies covering different topics in Physics, Chemistry, and Biology. It will provide you with ample practice opportunities to enhance your analytical and problem-solving skills.

• Case Study Questions for Chapter 1 Chemical Reactions and Equations
• Case Study Questions for Chapter 2 Acids, Bases, and Salts
• Case Study Questions for Chapter 3 Metals and Non-Metals
• Case Study Questions for Chapter 4 Carbon and Its Compounds
• Case Study Questions for Chapter 5 Periodic Classification of elements
• Case Study Questions for Chapter 6 Life Processes
• Case Study Questions for Chapter 7 Control and Coordination
• Case Study Questions for Chapter 8 How do organisms reproduce?
• Case Study Questions for Chapter 9 Heredity and Evolution
• Case Study Questions for Chapter 10 Light reflection and refraction
• Case Study Questions for Chapter 11 Human eye and colorful world
• Case Study Questions for Chapter 12 Electricity
• Case Study Questions for Chapter 13 Magnetic effects of current
• Case Study Questions for Chapter 15 Our Environment

The above  Case studies for Class 10 Science will help you to boost your scores as Case Study questions have been coming in your examinations. These CBSE Class 10 Science Case Studies have been developed by experienced teachers of schools.studyrate.in for the benefit of Class 10 students.

• Class 10th Maths Case Study Questions

Benefits of Case Study Questions

Engaging with case study questions in Class 10 Science offers several benefits. Let’s explore some of them:

• Real-life application: Case study questions allow you to apply scientific concepts to real-life situations, enhancing your understanding of their practical relevance.
• Critical thinking skills: Analyzing case studies promotes critical thinking by challenging you to evaluate information, identify patterns, and draw logical conclusions.
• Problem-solving abilities: Case study questions require you to identify problems, propose solutions, and make informed decisions based on scientific evidence.
• Holistic learning: By examining different aspects of a case, you gain a broader perspective on scientific concepts and their interconnections.
• Preparation for higher education: Case study questions prepare you for future academic pursuits by developing skills necessary for scientific research and analysis.

Understanding the Structure of Case Study Questions

Case study questions typically present a scenario or a problem related to a scientific concept. The questions may require you to analyze data, interpret graphs, or propose solutions based on the given information. It is important to read the case study carefully, identify key details, and understand the context before attempting to answer the questions.

Tips for Analyzing and Answering Case Study Questions

To effectively analyze and answer case study questions, consider the following tips:

• Read the case study thoroughly: Take your time to understand the scenario, paying attention to key details and any scientific concepts mentioned.
• Identify the problem or objective: Determine the main question or objective that the case study aims to address. This will guide your analysis and help you stay focused.
• Break down the questions: Carefully read each question and break it down into smaller parts. Identify the specific information or data required to answer each question accurately.
• Apply scientific knowledge: Utilize your understanding of scientific principles and concepts to analyze the case study. Make connections between the given information and relevant scientific theories.
• Support your answers: Whenever possible, support your answers with scientific evidence or reasoning. Refer to specific data, graphs, or concepts from the case study to justify your conclusions.

Subject-wise Approach to Case Study Questions

Let’s explore how to approach case study questions in the subjects of Physics, Chemistry, and Biology.

In Physics case study questions, focus on understanding the principles and laws governing the given scenario. Analyze the data provided and apply relevant formulas and concepts to solve the problem. Consider factors such as motion, forces, energy, and electrical circuits, depending on the context of the case study.

Chemistry case study questions often involve analyzing chemical reactions, properties of substances, or experimental data. Pay attention to the details of the case study, such as reactants, products, conditions, and observations. Apply your knowledge of chemical reactions, bonding, and periodic trends to interpret and solve the problem.

Biology case study questions revolve around biological processes, organisms, and ecological relationships. Analyze the provided information, such as species interactions, environmental factors, or experimental results. Apply your understanding of biological concepts, such as genetics, evolution, ecosystems, and cellular processes, to address the questions effectively.

Importance of Practicing Case Study Questions

Practicing case study questions in Class 10 Science is crucial for several reasons:

• Application of knowledge: Case study questions enable you to apply scientific knowledge to real-life situations, enhancing your understanding and practical skills.
• Analytical thinking: Regular practice of case study questions hones your analytical thinking skills by challenging you to analyze complex scenarios and make informed decisions.
• Comprehensive understanding: Engaging with case studies offers a holistic understanding of scientific concepts, allowing you to grasp their practical implications and interconnections.
• Exam preparation: Practicing case study questions familiarizes you with the question patterns and formats commonly seen in Class 10 Science examinations, boosting your confidence and performance.

Case study questions offer a valuable opportunity to apply scientific knowledge in practical contexts. By engaging with these questions, you can develop critical thinking, problem-solving, and analytical skills necessary for success in Class 10 Science. Remember to carefully analyze the case study, apply your scientific understanding, and justify your answers with relevant evidence. Regular practice of case study questions will greatly enhance your overall performance in examinations.

Where can I find Class 10 Science case study questions?

You can download a comprehensive PDF resource containing Class 10 Science case study questions from schools.studyrate.in This resource is specifically designed to provide you with ample practice material.

Why is practicing case study questions important for exam preparation?

Regular practice of case study questions enhances your ability to apply scientific knowledge in practical contexts, improving your analytical thinking and problem-solving abilities. This ultimately contributes to better performance in Class 10 Science examinations.

How should I approach Class 10 Science case study questions?

Read the case study carefully, identify the problem or objective, and analyze the given information. Apply your scientific knowledge to address the questions and support your answers with relevant evidence.

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Case Study Questions Class 10 Science

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Download Case study questions for CBSE class 10 Science in PDF format from the myCBSEguide App . We have the new pattern case study-based questions for free download. Class 10 Science case study questions

This article will guide you through:

What are case study questions?

• Sample Papers with Case Study questions
• Class 10 Science Case Study question examples
• How to get case-based questions for free?
• How to attempt the case-based questions in Science?

Questions based on case studies are some real-life examples. The questions are asked based on a given paragraph i.e. Case Study.  Usually, 4-5 questions are asked on the basis of the given passage. In most cases, these are either MCQs or assertion & reason type questions. Let’s take an example to understand. There is one paragraph on how nitrogen is generated in the atmosphere. On the basis of this paragraph, the board asks a few objective-type questions. In other words, it is very similar to the unseen passages given in language papers. But the real cases may be different. So, read this article till the end to understand it thoroughly.

What is CBE?

CBSE stands for competency-based education. The case study questions are part of this CBE. The purpose of CBE is to demonstrate the learning outcomes and attain proficiency in particular competencies.

Questions on Real-life Situations

As discussed the case study questions are based on real-life situations. Especially for grade 10 science, it is very essential to have the practical knowledge to solve such questions. Here on the myCBSEguide app, we have given many such case study paragraphs that are directly related to real-life implications of the knowledge.

Sample Papers with Case Study Questions

Class 10 Science Sample Papers with case study questions are available in the myCBSEguide App . There are 4 such questions (Q.No.17 to 20) in the CBSE model question paper. If you analyze the format, you will find that the MCQs are very easy to answer. So, we suggest you, read the given paragraph carefully and then start answering the questions. In some cases, you will find that the question is not asked directly from the passage but is based on the concept that is discussed there. That’s why it is very much important to understand the background of the case study paragraph.

CBSE Case Study Sample Papers

You can download CBSE case study sample papers from the myCBSEguide App or Student Dashboard. Here is the direct link to access it.

Case Study Question Bank

As we mentioned that case study questions are coming in your exams for the last few years. You can get them in all previous year question papers issued by CBSE for class 1o Science. Here is the direct link to get them too.

Class 10 Science Case Study Question Examples

As you have already gone through the four questions provided in the CBSE model question paper , we are proving you with other examples of the case-based questions in the CBSE class 10 Science. If you wish to get similar questions, you can download the myCBSEguide App and access the Sample question papers with case study-type questions.

Case-based Question -1

Read the following and answer any four questions: Salt of a strong acid and strong base is neutral with a pH value of 7. NaCl common salt is formed by a combination of hydrochloride and sodium hydroxide solution. This is the salt that is used in food. Some salt is called rock salt bed of rack salt was formed when seas of bygone ages dried up. The common salt thus obtained is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda, and bleaching powder.

• Phosphoric acid
• Carbonic acid
• Hydrochloric acid
• Sulphuric acid
• Blue vitriol
• Washing soda
• Baking soda
• Bleaching powder

Case-based Question -2

• V 1  + V 2  + V 3
• V 1  – V 2  +V 2
• None of these
• same at every point of the circuit
• different at every point of the circuit
• can not be determined
• 20 3 Ω 203Ω
• 15 2 Ω 152Ω

Case-based Question -3

• pure strips
• impure copper
• refined copper
• none of these
• insoluble impurities
• soluble impurities
• impure metal
• bottom of cathode
• bottom of anode

How to Attempt the Case-Based Questions in Science?

Before answering this question, let’s read the text given in question number 17 of the CBSE Model Question Paper.

All living cells require energy for various activities. This energy is available by the breakdown of simple carbohydrates either using oxygen or without using oxygen.

See, there are only two sentences and CBSE is asking you 5 questions based on these two sentences. Now let’s check the first questions given there.

Energy in the case of higher plants and animals is obtained by a) Breathing b) Tissue respiration c) Organ respiration d) Digestion of food

Now let us know if you can relate the question to the paragraph directly. The two sentences are about energy and how it is obtained. But neither the question nor the options have any similar text in the paragraph.

So the conclusion is, in most cases, you will not get direct answers from the passage. You will get only an idea about the concept. If you know it, you can answer it but reading the paragraph even 100 times is not going to help you.

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Important Case Study Questions for CBSE Class 10 Science Exam 2024 with Answers

Download case study questions for class 10 science to prepare for the cbse board exam 2024. these multiple choice type questions with answers are published by the cbse board to provide sample questions to students..

CBSE Class 10 Science Case Study Questions 2024: Get here the questions based on case studies to practise for the CBSE Class 10 Science exam 2024. The CBSE Class 10 Science Question Bank on Case Studies, provided in this article, can be very helpful for understanding how the source based or case based questions are asked in the board exam. This question bank is published by the CBSE Board itself which makes it a very reliable source for the board exam preparations. Each question has five sub-questions with each followed by four options and a correct answer. Students can easily download these sample questions in PDF format and refer to the same for their exam preparations.

Note: Check the reduced CBSE Syllabus for Class 10 Science for 2024 Exam and then practise the case study questions accordingly for the CBSE Class 10 Board Exam 2024.  

Important*  Important Last Minute Tips and Resources for CBSE Class 10 Science Exam 2024

SCIENCE- Class X

Sample Case Studies

1. Read the following and answer any four questions from 1.1 to 1.5:

Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

1.1 The substance not likely to contain CaCO 3 is

a) Dolomite

b) A marble statue

c) Calcined gypsum

d) Sea shells.

Answer: c) Calcined gypsum

1.2 A student added 10g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place?

a) 15-20 min

b) 10-15 min

c) 5-10 min

Answer: d) 0-5 min

1.3 Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process -

a) Respiration

b) Photosynthesis

c) Transpiration

d) sphotolysis

Answer: b) Photosynthesis

1.4 Marble statues are corroded or stained when they repeatedly come into contact with polluted rain water. Identify the main reason.

a) decomposition of calcium carbonate to calcium oxide

b) polluted water is basic in nature hence it reacts with calcium carbonate

c) polluted water is acidic in nature hence it reacts with calcium carbonate

d) calcium carbonate dissolves in water to give calcium hydroxide.

Answer: c) polluted water is acidic in nature hence it reacts with calcium carbonate

1.5 Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process?

b) sodium oxide

d) calcium oxide

Answer: d) calcium oxide

2. Read the following and answer any four questions from 2.1 to 2.5:

The reaction between MnO2 with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released.

2.1 The chemical reaction between MnO 2 and HCl is an example of:

a) displacement reaction

b) combination reaction

c) redox reaction

d) decomposition reaction

Answer: c) redox reaction

2.2 Chlorine gas reacts with _______ to form bleaching powder.

a) dry Ca(OH) 2

b) dil. solution of Ca(OH) 2

c) conc. solution of Ca(OH) 2

Answer: a) dry Ca(OH) 2

2.3 Identify the correct statement from the following:

a) MnO 2 is getting reduced whereas HCl is getting oxidized

b) MnO 2 is getting oxidized whereas HCl is getting reduced.

c) MnO 2 and HCl both are getting reduced.

d) MnO 2 and HCl both are getting oxidized.

Answer: a) MnO 2 is getting reduced whereas HCl is getting oxidized

2.4 In the above discussed reaction, what is the nature of MnO 2 ?

a) Acidic oxide

b) Basic oxide

c) Neutral oxide

d) Amphoteric oxide

Answer: b) Basic oxide

2.5 What will happen if we take dry HCl gas instead of aqueous solution of HCl?

a) Reaction will occur faster.

b) Reaction will not occur.

c) Reaction rate will be slow.

d) Reaction rate will remain the same.

Answer: b) Reaction will not occur.

Also, check below other important study material released by the CBSE Board:

CBSE Class Maths Case Study Questions for All Chapters (Published by CBSE)

MCQs for Class 10 English Footprints without Feet (Published by CBSE)

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CBSE 10th Standard Science Subject Chemical Reactions and Equations Chapter Case Study Questions With Solution 2021

By QB365 on 21 May, 2021

QB365 Provides the updated CASE Study Questions for Class 10 , and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get  more marks in Exams 

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Cbse 10th standard science subject chemical reactions and equations case study questions with solution 2021.

10th Standard CBSE

Final Semester - June 2015

Chemical equation is a method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it. In a chemical equation, the substances which combine or react are called reactants and new substances produced are called products. A chemical equation is a short hand method of representing a chemical reaction. A balanced chemical equation has equal number of atoms of different elements in the reactants and products side. An unbalanced chemical equation has unequal number of atoms of one or more elements in reactants and products. Formulae of elements and compounds are not changed to balance an equation. (i) Consider the following reaction: pMg 3 N 2 + qH 2 O ⇾ rMg(OH) 2 + sNH 3 When the equation is balanced, the coefficients p, q, r, s respectively are

(ii) Which of the following information is not conveyed by a balanced chemical equation?

(iii) The balancing of chemical equations is in accordance with

(iv) Which of the following chemical equations is an unbalanced one?

(v) Which of the following statements is/are correct?

In decomposition reactions, a single reactant breaks down to form two or more products. A decomposition reaction is opposite to combination reaction. Thermal decomposition reactions use the energy in form of heat for the decomposition of reactants. Electrolytic decomposition reactions involve the use of electrical energy for the decomposition of reactant molecules. Photolysis or photochemical decomposition involves the use of light energy for the purpose of decomposition. (i) Which of the following reactions is a decomposition reaction?

\({ (ii) \ } 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \longrightarrow 2 \mathrm{PbO}+n A+\mathrm{O}_{2}\) What is nA in the given reaction?

(iii) Amino acid is formed by the decomposition of which component of our diet?

(iv) Silver chloride on exposure to sunlight for a long duration turns grey due to (I) the formation of silver by decomposition of silver chloride (II) sublimation of silver chloride (III) decomposition of chlorine gas from silver chloride (IV) oxidation of silver chloride The correct statement(s) is/are

(v) What type of chemical reaction takes place when electricity is passed through water?

Redox reactions are those reactions in which oxidation and reduction occur Simultaneously. A redox reaction is made up of two half reactions. In the first half reaction, oxidation takes place and in second half reaction, reduction occurs. Oxidation is a process in which a substance loses electrons and in reduction, a substance gains electrons. The substance which gains electrons is reduced and acts as an oxidising agent. On the other hand, a substance which loses electrons is oxidised and acts as a reducing agent. (i) Which of the following is a redox reaction?

(ii) Identify the reaction in which H2 02 is acting as a reducing agent.

(iii) For the following reactions, identify the one in which H 2 S acts as a reducing agent.

(iv) For the following reaction, identify the correct statement. \(\mathrm{ZnO}+\mathrm{CO} \longrightarrow \mathrm{Zn}+\mathrm{CO}_{2}\)

(v) In the following reaction, which substance is reduced? \(\mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O}\)

In a balanced chemical reaction, equal number of atoms are present on both sides of reaction. A balanced chemical reaction is based on law of conservation of mass which means that total mass of reactants and products participating in a reaction must be equal. For example, a balanced chemical equation of burning of magnesium in oxygen to form magnesium oxide is written as : \(2 \mathrm{Mg}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{MgO}\) The mass of reactants (2 x 24 + 32 = 80) is equal to the mass of products [2 x (24 + 16) = 80] (i) In a reaction, 35 g of reactant, PQ breaks down into 20 g of product, P and an unknown amount of product, Q. Using the law of conservation of mass, weight of products, Q will be

(ii) When solid mercury (II) oxide is heated, liquid mercury and oxygen gas are produced. Which of the following statements is true regarding the balanced chemical equation for this process? (a) 1 mole of mercury (II) oxide produces two moles of mercury and one mole of oxygen gas (b) 2 moles of mercury (II) oxide produce one mole of mercury and one mole of oxygen gas (c) 1 mole of mercury (II) oxide produces half mole of mercury and half mole of oxygen gas (d) 2 moles of mercury (II) oxide produce 2 moles of mercury and one mole of oxygen gas (iii) Which of the following laws is satisfied by a balanced chemical equation?

(iv) In the given chemical reaction \(\mathrm{C}_{6} \mathrm{H}_{6(l)}+15 \mathrm{O}_{2(g)} \longrightarrow m \mathrm{CO}_{2(g)}+n \mathrm{H}_{2} \mathrm{O}_{(l)}\) The values of m and n are respectively

(v) Sulphur dioxide reacts with oxygen to form sulphur trioxide. What would be the molar ratio of sulphur dioxide to sulphur trioxide?

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features which can be observed easily. These easily observed features which take place as a result of chemical reaction are known as characteristics of chemicals reactions. Some important characteristics of chemical reactions are:  (I) Evolution of heat  (II) Formation of precipitate (III) Change in colour (IV) Change in temperature (V) Change in state Anyone of these general characteristics can tell us whether a chemical reaction has taken place or not. (i) Reaction of magnesium with air is a/an

(ii) In the following reaction \(\mathrm{Ca}_{(a q)}^{2+}+2 \mathrm{OH}_{(a q)}^{-} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2(s)}\) precipitate of calcium hydroxide will be of

(iii) In the given reaction, \(\mathrm{S}_{(s)}+\mathrm{O}_{2(g)} \longrightarrow \mathrm{SO}_{2}\) the physical state of SO 2 is

(iv) Which one of the following processes involve chemical reactions?

(v) In which of the following reactions, high amount of heat energy will be evolved?

*****************************************

Cbse 10th standard science subject chemical reactions and equations case study questions with solution 2021 answer keys.

\({ (i) }(\mathrm{b}): \mathrm{Mg}_{3} \mathrm{~N}_{2}+6 \mathrm{H}_{2} \mathrm{O} \longrightarrow 3 \mathrm{Mg}(\mathrm{OH})_{2}+2 \mathrm{NH}_{3}\) (ii) (d) (iii) (c): In a balanced chemical equation, total mass of reactants must be equal to the total mass of products. This is the statement of law of conservation of mass. (iv) (b) (v) (d)

(i) (c) \({ (ii) \ }(b): \ 2 \mathrm{~Pb}\left(\mathrm{NO}_{3}\right)_{2} \longrightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_{2}+\mathrm{O}_{2}\) (iii) (c) : Proteins in our diet get broken down into amino acids. \({ (iv) }(\mathrm{a}): 2 \mathrm{AgCl}_{(\mathbf{s})} \stackrel{\text { Sunlight }}{\longrightarrow} 2 \mathrm{Ag}_{(s)}+\mathrm{Cl}_{2(g)}\) (v) (b): Electrolysis of water is electrolytic decomposition. \(\mathrm{H}_{2} \mathrm{O} \stackrel{\text { Current }}{\longrightarrow} 2 \mathrm{H}_{2}+\mathrm{O}_{2}\)

(I) (b) : H 2 is oxidised to HCI while Cl 2 is reduced to HCl. (ii) (c) \((iii) (c): 2 \mathrm{Fe} \mathrm{Cl}_{3}+\mathrm{H}_{2} \mathrm{~S} \longrightarrow 2 \mathrm{FeCl}_{2}+2 \mathrm{HCl}+\mathrm{s}\) H 2 Sitself gets oxidised to Sand reduces FeCl 3 to FeCI 2 (iv) (a ): ZnO is reduced to Zn and CO is oxidised to CO 2 (v) (b) : H 2 O 2 is reduced to water by removal of oxygen.

\(\text { (i) }(\mathbf{d}): P Q \longrightarrow P+Q\)                 \(35 \mathrm{~g} \quad \ \ \ 20 \mathrm{~g}+\text { ? }\) According to law of conservation of mass, Mass of PQ = Mass of P + Mass of Q   \(\therefore\)  Mass of Q = (35 - 20)g = 15 g \({ (ii) \ }(\mathbf{d}): 2 \mathrm{HgO}_{(s)} \longrightarrow 2 \mathrm{Hg}_{(l)}+\mathrm{O}_{2(g)}\) (iii) (b) (iv) (b) (v) (b)

(i) (a) (ii) (d) : Calcium hydroxide is a white colour solid. (iii) (c) : SO 2 is gaseous in nature. (iv) (d) : When copper is heated in the presence of air in a very high temperature, a chemical reaction takes place. Copper reacts with oxygen of the air to form a thin layer of copper oxide on the surface of metallic copper (v) (c) : On burning ofL.P.G., heat is evolved.

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Case Study Question for Class 10 Science (CBSE Board)

Case Study Question Class 10 Science for CBSE Board: Understudies can discover the chapter astute vital questions for course 10th Science within the table underneath. These imperative questions incorporate questions that are regularly inquired in a long time. Moreover, arrangements are to give for these questions, with extraordinary accentuation on ease-of-study. Tap on the joins underneath to begin investigating.

Case Study Question for Class 10 Science Ch. 1 to 16

Case study: 1.

1) Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation. (CBSE Sample Paper 2022)

a.) What will be set of genes present in the F1 generation? (1 Mark)

b.) Give reason why only tall plants are observed in F1 progeny. (1 Mark)

Ans. Traits like ‘T’ are called dominant traits, while those that behave like ‘t’ are called recessive traits./Alternatively accept the definition of dominant and recessive traits with examples of T and t respectively /Alternatively accept the law of Dominance with examples of T and t.

c.) When F1 plants were self – pollinated, a total of 800 plants were produced.

How many of these would be tall, medium height or short plants? Give the genotype of F 2 generation. (2 Marks)

When F1 plants were cross – pollinated with plants having tt genes, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F 2 generation.

Ans. Out of 800 plants 600 plants will be tall and 200 plants will be small, 1

TT: 2Tt: 1tt (1 mark)

In the cross between Tt X tt, 400 Tall (Tt) and 400 short (tt) plants will be produced.

Case Study: 2 Question Class 10 Science

2) Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below. (CBSE Sample Paper 2022)

A magnet is attached to a spring. The magnet can go in and out of the stationary coil.

He lifted the Magnet and released it to make it oscillate through the coil. Based on your understanding of the phenomenon, answer the following questions.

a.) What is the principle which Ansari Sir is trying to demonstrate?

Ans. Sir is trying to demonstrate the principle of Electromagnetic induction.

b.) What will be observed when the Magnet starts oscillating through the coil. Explain the reason behind this observation.

Ans. There will be induced current in the coil due to relative motion between the magnet and the coil. Changing the magnetic field around the coil generates induced current.

c.) Consider the situation where the Magnet goes in and out of the coil. State two changes which could be made to increase the deflection in the galvanometer.

Is there any difference in the observations in the galvanometer when the Magnet swings in and then out of the stationary coil? Justify your answer.

Using a stronger magnet, using a coil with more number of turns.

When the magnet moves into the coil, the ammeter shows a momentary deflection towards one side say left.

When the magnet moves out of the coil, the ammeter shows a momentary deflection now towards right.

This is due to changing magnetic field /flux associated with the coil as the magnet moves in and out.

Alternatively, the flux increases when the magnet goes in and it decreases when the magnet goes out.

• NCERT Class 10 Science Best Solution
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Case Based Questions Class 10 Science Chapter-wise:

Key questions for 10th review science are outlined agreeing to the CBSE NCERT program. All address sorts are accessible within the PDF, from one-word to one-line answers, brief reply sorts to five point long reply sorts. Hence, understudies can plan for exams and indeed clarify their concepts through them. On the off chance that they refer to these questions, it’ll get ready their minds to pick up a competitive advantage. Understudies will gotten to be commonplace with question patterns and the sorts of questions that will show up on exams.

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CBSE Class 10 Science Case Study Questions Download Free PDF

If you are looking for the CBSE Class 10 Science Case Study Questions in PDF, then you are in the right place. CBSE 10th Class Case Study for the Science Subject is available here. These Case studies can help the students to solve the different types of questions that are based on the case study.

CBSE Board will be asking case study questions based on Science subjects in the upcoming board exams. Thus, it becomes an essential resource to study. 

The Science Subject case study for class 10th covers a wide range of chapters from the Science. Students willing to score good marks in their board exams can use it. The questions are highly interactive and it allows students to use their thoughts and skills to solve such kinds of questions.

Case Study Questions Class 10 Science

In board exams, students will find the questions based on assertion and reasoning . Also, there will be a few questions based on case studies. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

• Case Study Questions for Chapter 1 Chemical Reactions and Equations
• Case Study Questions for Chapter 2 Acids, Bases, and Salts
• Case Study Questions for Chapter 3 Metals and Non-Metals
• Case Study Questions for Chapter 4 Carbon and Its Compounds
• Case Study Questions for Chapter 5 Periodic Classification of elements
• Case Study Questions for Chapter 6 Life Processes
• Case Study Questions for Chapter 7 Control and Coordination
• Case Study Questions for Chapter 8 How do organisms reproduce?
• Case Study Questions for Chapter 9 Heredity and Evolution
• Case Study Questions for Chapter 10 Light reflection and refraction
• Case Study Questions for Chapter 11 Human eye and colorful world
• Case Study Questions for Chapter 12 Electricity
• Case Study Questions for Chapter 13 Magnetic effects of current
• Case Study Questions for Chapter 15 Our Environment

The above  Case studies  for CBSE Class 10 Science will help you to score good marks in the Case Study questions that have been coming in your examinations. These CBSE Class 10 Science Case Study have been developed by experts of cbseexperts.com   for benefit of Class 10 students.

Class 10 Science Assertion and Reason Questions

Case Study Type Questions in Science Class 10

Case Study Type Questions in Science Class 10 include the information or data. Students willing to solve them are required to read the passage carefully and then solve them. While solving the paragraph the ideal way is to highlight the key information or given data.

Because later it will ease them to write the final answers. Science Case study type questions consist of 4 to 5 questions that should be answered in an MCQ manner. 

While reading the paragraph students will get the clue in between about the possible answer of the question. They should definitely highlight those questions. This is the best way to solve such kind of Case study Type Questions.

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Question 5 - Case Based Questions (MCQ) - Chapter 1 Class 10 - Chemical Reactions and Equations

Last updated at April 16, 2024 by Teachoo

In the following chemical reaction zinc oxide reacts with carbon to produce zinc metal and  carbon monoxide.’’

Zno + c → zn + co  , (a) name the substance getting oxidised and reduced  in the above reaction:   , (i) c and zno , (ii) zn and c  , (iii) zno and co , (iv) co and zno  .

ZnO + C → Zn + CO 

• Addition of oxygen is known as oxidation 
• Removal of oxygen is known as reduction.

Since in the equation

• Oxygen is being removed from ZnO
•  and is added to C.

Therefore, C is undergoing oxidation and ZnO reduction. 

So, the correct answer is (i) C and ZnO  

(b) Name the type of reaction:  

(i) oxidation reaction  , (ii) reduction reaction  , (iii) redox reaction  , (iv) decomposition reaction  .

Since both oxidation and reduction is taking place in this reaction, it is a redox reaction.

So, the correct answer is (iii) redox reaction  

(c) The reduction reaction involves:  

(i) gain of electrons  , (ii) loss of electrons  , (iii) increase in oxidation state  , (iv) addition of oxygen  .

So, the correct answer is (i) gain of electrons

(d) Which of the following is the effect of oxidation  reaction in everyday life:  

(i) precipitation  , (ii) fermentation  , (iii) corrosion  , (iv) hydrogenation of oil  .

Let’s look at each of the reaction , one by one

• Precipitation reaction reaction is not an oxidation reaction because this simply involves the formation of an insoluble substance (precipitate).
• Fermentation breaking down of food in the absence of oxygen
• Corrosion involves the oxidation of iron to form rust
• Hydrogenation of oil is not an oxidation reaction because in this, hydrogen atoms are added over the double bonds of hydrocarbons. 

So, the correct answer is (iii) Corrosion

(e) The reactions used in black and white photography:   

(i) decomposition of silver bromide  , (ii) decomposition of silver chloride  , (iii) both  , (iv) none of the above  .

Black and white photography is looks like

• The photographic papers are prepared by using silver chloride and silver bromide which are initially white in color.
• On exposure to air, AgCl and AgBr decompose and lose their color and black and white images are obtained.

So, the correct answer is (iii) Both

Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo

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Case Study Questions for Class 10 Science Chapter 1

Case Study Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations  provided below is very helpful to understand the new format of Board Exams.  Case Study Questions for class 10 Chemistry  is a very trustable source for practice.  Class 10 Science Chapter 1 Case Study Questions  is provided to you by NCERT HUB.

Solve the given  Case Study Questions for Class 10 Science Chapter 1   to enhance your performance in the upcoming Board Exam.  Case Study Questions for Class 10 Chemical Reactions and Equations  is very important as these types of questions will be asked in the Board Exam.

Case Study Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations

1. Read the following and answer the questions from 1.1 to 1.5 :

Amit took a lime solution and passed a gas ‘X’ through it. The solution becomes turgid. This solution was then divided into two parts. In the first part, more of gas ‘X’ was passed. While in the second part concentrated sulphuric acid was added. A white precipitate was formed in second part.

1.1) The gas mentioned in above passage is : (a) O₂ (b) H₃S (c) CO₂ (d) H₂ Answer

1.2) Lime water and chlorine reacts to form : (a) CaCl₂ (b) CaOCl₂ (c) CaO (d) CaCO Answer

1.3) A solution of a substance X is used for white washing. Identify X : (a) CaO (b) Ca(OH)₂ (c) CaCO₃ (d) CO₂

1.4) Ca(HCO₃) is : (a) insoluble in water (b) soluble in water (c) partially soluble in water (d) partially insoluble in water Answer

1.5) Lime water turns milky in the reaction due to the : (a) oxygen gas is evolved (b) formation of calcium bicarbonate (c) CO₂ gas is evolved (d) formation of calcium carbonate Answer

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2. Read the following and answer the questions from 2.1 to 2.5 :

In decomposition reactions, a single reactant breaks down to form two or more products. Decomposition reaction is opposite to combination reaction. Thermal decomposition reactions use the energy in form of heat for decomposition of reactants. Electrolytic decomposition reactions involve the use of electrical energy for the decomposition of reactant molecules. Photolysis or or photochemical decomposition involves the use of light energy for the purpose of decomposition.

2.1) Which of the following reactions is a decomposition reaction ? (a) NaOH + HCl → NaCl + H₂O (b) NH₄CNO → H₂NCONH₂ (c) 2KClO₃ → 2KCl + 3O₂ (d) H₂ + I₂ → 2HI Answer

2.2)  2Pb(NO3 )2 → 2PbO + nA + O₂. What is nA in the given reaction ? (a) NO₂ (b) 2PbNO₂ (c) 4NO₂ (d) 4NO Answer

2.3) Amino acid is formed by the decomposition of which component of our diet ? (a) Fat (b) Protein (c) Starch (d) Carbohydrate Answer

2.4) Silver chloride on exposure to sunlight for a long duration turns grey due to (i) the formation of silver by decomposition of silver chloride (ii) Sublimation of silver chloride (iii) decomposition of chlorine gas from silver chloride (iv) Oxidation of silver chloride. The correct statement(s) is / are :

(a) Only (iv) (b) Only (i) and (iii) (c) Only (ii) and (iii) (d) Only (i) and (ii) Answer

2.5) What type of chemical reaction takes place when electricity is passed through water ? (a) Displacement reaction (b) Photochemical decomposition (c) Electrolytic decomposition (d) Thermal decomposition Answer

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3. Read the following and answer the questions from 3.1 to 3.5 :

Redox reactions are those reactions in which oxidation and reduction occur simultaneously. A redox reaction is made up of two half reactions. In the first half reaction, Oxidation takes place and in second half reaction, reduction occurs. Oxidation is a process in which a substance loses electrons and in reduction, a substance hydrogen to a substance and removal of oxygen from a substance. 

The substance which gives oxygen to another substance or removes hydrogen from another substance in an oxidation reaction is known as oxidising agent, while the substance which gives hydrogen to another substance or removes oxygen from another substance in a reduction reaction is known as reducing agent. 

3.1) Which of the following is a redox reaction? (a) CaCO₃ → CaO + CO₂ (b) CaO + 2HCl → CaCl₂ + H₂O (c) H₂ + Cl₂ → 2HCl (d) NaOH + HCl → NaCl + H₂O Answer

3.2) Identify the reaction in which H₂O₂ is acting as a reducing agent. (a) Cl₂ + H₂O₂ → 2HCl + O₂ (b) 2FeCl₂ + 2HCl + H₂O₂ → 2FeCl₃ + 2H₂O (c) H₂SO₃ + H₂O₂ → H₂SO₄ + H₂O (d) 2HI + H₂O₂ → 2H₂O + I₂ Answer

3.3) For the following reaction, identify the correct statement.

                ZnO + CO → Zn + CO₂ 

(a) CO₂ is being oxidised. (b) ZnO is being reduced. (c) ZnO is being oxidised. (d) CO is being reduced. Answer

3.4) In the following reaction, which substance is reduced ?

            PbS + 4H₂O₂ → PbSO₄ + 4H₂O (a) PbSO₄ (b) PbS (c) H₂O (d) H₂O₂ Answer

3.5) For the following reactions, identify the one in which H₂S acts as a reducing agent . (a) CuSO₄ + H₂S → CuS + H₂SO₄ (b) Cd(NO₃)₂ + H₂S → CdS + 2HNO₃ (c) 2FeCl₃ + H₂S → 2FeCl₂ + 2HCl + S (d) None of these Answer

Practice Case Study Questions for Class 10 Science Chapter 1 to boost your score in Board Exam.

4. Read the following and answer the questions from 4.1 to 4.5 :

In a chemical reaction, reactants are converted into products. The conversion of reactants into products in a chemical reaction is often accompanied by some features. These features which take place as a result of chemical reaction are known as characteristics of chemical reactions. Some important characteristics of chemical reactions are : evolution of heat, change in colour, change in temperature etc.

4.1) Reaction of magnesium with air is : (a) exothermic reaction (b) substitution reaction (c) endothermic reaction (d) reversible reaction Answer

4.2) Which law is satisfied by a balanced chemical equation ? (a) Law of multiple proportions (b) Law of constant proportions (c) Law of conservation of mass (d) Law of conservation of chemical Answer

4.3) Which one of the following processes involve chemical reactions ? (a) Storing of Oxygen gas under pressure in a gas cylinder (b) Liquefication of air (c) Keeping petrol in china dish in the open (d) Heating copper wire in the presence of air at high temperature Answer

4.4) In which of the following reactions, high amount of heat energy will be evolved ? (a) Electrolysis of water (b) Burning of LPG (c) Decomposition of AgBr in the presence of light (d) Dissolution of NH₄Cl in water Answer

4.5) What type of chemical reaction takes place when electricity is passed through water ? (a) Thermal decomposition (b) Photochemical decomposition (c) Water decomposition (d) Electrolytic decomposition Answer

5. Read the following and answer the questions from 5.1 to 5.5 :

You must have observed that iron articles are shiny when they are new, but get coated with a reddish brown powder when left for sometime. This process is commonly known as rusting of iron. Some other metals also get tarnished in the same manner. When a metal is attacked by substances around it such as moisture, its said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are some examples of corrosion.

5.1) Chemically rust is : (a) hydrated ferrous oxide (b) hydrated ferric oxide (c) only ferric oxide (d) None of these Answer

5.2) Rusting of iron involves a chemical reaction which is a combination of : (a) Oxidation as well as combination reactions (b) Reduction as well as displacement reactions (c) Oxidation as well as displacement reactions (d) Reduction as well as combination reactions Answer

5.3) Rusting of iron takes place in : (a) ordinary water (b) distilled water (c) Both (a) and (b) (d) None of these Answer

5.4) Silver articles turns black when kept in the open for a few days due to formation of : (a) Ag₂S (b) H₂S (c) AgS (d) AgSO₄ Answer

5.5) Copper objects lose their shine and form green coating of : (a) copper oxide (b) copper carbonate (c) basic copper carbonate (d) copper hydroxide and copper oxide Answer

We hope the given  Case Study Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations  provided below is very helpful to understand the new format of Board Exams. Case Study Questions for class 10 Chemistry Chapter 1 is a very trustable source for practice. If you have any queries regarding Case Study Questions for Class 10 Science Chapter 1, contact us and we will get back to you soon.

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NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Chapter 1 Chemical Reactions and Equations Class 10 NCERT Solutions

Ncert solutions for class 10 science chapters:, state the law which is kept in mind while we balance a chemical equation., what is basic difference between a physical change and a chemical change, what is meant by a chemical reaction, is burning of a candle, a physical change or a chemical change, why are decomposing reactions called the opposite of combination reactions, contact form.

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NCERT Exemplar Class 10 Science Solutions for Chapter 1 - Chemical Reactions and Equations

Ncert exemplar solutions class 10 science chapter 1 – free pdf download.

NCERT Exemplar Class 10 Science Chapter 1 Chemical Reactions and Equations will help you understand all the fundamentals of chemical reactions as well as their symbolic representation in terms of equations. Here, students will learn to recognise chemical changes, write equations, classify chemical reactions and basically list a few examples of chemical reactions.

Thus, to help students get a clear idea about the chapter and the topics, we provide the free NCERT Exemplar for Class 10 Science Chapter 1 – Chemical Reactions and Equations PDF here. The exemplar is prepared by subject experts and is designed to help students get the right answers to questions and have a thorough revision of the entire chapter. The NCERT Exemplar act as a very useful study tool and will help students to perform well in the board exam.

Download the PDF of NCERT Exemplar for Class 10 Science Chapter 1 – Chemical Reactions and Equations

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Multiple-choice questions.

1. Which of the following is not a physical change?

(a) Boiling of water to give water vapour

(b) Melting of ice to give water

(c) Dissolution of salt in water

(d) Combustion of Liquefied Petroleum Gas (LPG)

Answer is (d) Combustion of Liquefied Petroleum Gas (LPG)

Explanation:

Combustion is always a chemical change because a new compound is formed after burning and it is irreversible.

2. The following reaction is an example of a:

4NH 3 (g) + 5O 2 (g) → 4NO(g) + 6H 2 O(g)

(i) displacement reaction

(ii) combination reaction

(iii) redox reaction

(iv) neutralisation reaction

(a) (i) and (iv)

(b) (ii) and (iii)

(c) (i) and (iii)

(d) (iii) and (iv)

Soln:   (c)   (i) and (iii)

The reaction provided is a mixture of displacement and redox reaction. Oxygen displaces hydrogen in the ammonia, making it a displacement reaction. Nitrogen gets oxidized and oxygen is reduced, resulting in a redox reaction.

3. Which of the following statements about the given reaction are correct?

3Fe(s) + 4H 2 O(g) → Fe 3 O 4 (s) + 4H 2 (g)

• Iron metal is getting oxidised
• Water is getting reduced
• Water is acting as a reducing agent
• Water is acting as an oxidising agent

(a) (i), (ii) and (iii)

(b) (iii) and (iv)

(c) (i), (ii) and (iv)

(d) (ii) and (iv)

Soln: (c) (i), (ii) and (iv)

Here, oxygen combines with water to get oxidised. Oxygen is removed from water hence, it is getting reduced. Water provides oxygen, and it acts as an oxidizing agent.

4. Which of the following are exothermic processes?

(i) The reaction of water with quick lime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

(a) (i) and (ii)

(c) (i) and (iv)

Soln: (a) (i) and (ii)

The exothermic processes release an enormous amount of heat – Hence, heat energy is released when water reacts with quick lime and acid reacts with water.

5. Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C, respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in the case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?

(i) In beakers A and B, the exothermic process has occurred.

(ii) In beakers A and B, the endothermic process has occurred.

(iii) In beaker C exothermic process has occurred.

(iv) In beaker C endothermic process has occurred.

(a) (i) only

(b) (ii) only

(d) (ii) and (iii)

Answer is (c) (i) and (iv)

Exothermic processes will increase the temperature whereas endothermic processes will decrease the temperature.

6. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

(a) KMnO4 is an oxidising agent, it oxidises FeSO4

(b) FeSO4 acts as an oxidising agent and oxidises KMnO4

(c) The colour disappears due to dilution; no reaction is involved

(d) KMnO4 is an unstable compound and decomposes in the presence of FeSO4 to a colourless compound.

Soln: (a) KMnO4 is an oxidising agent, it oxidises FeSO4

In this reaction, potassium permanganate (KMnO4) is an oxidizing agent.

The solution is coloured purple because of the KMnO4 and it eventually disappears when all the KMnO4 in the solution is utilized.

7. Which among the following is(are) double displacement reaction(s)?

(i) Pb + CuCl2 → PbCl2 + Cu

(ii) Na2 SO4 + BaCl2 → BaSO4 + 2NaCl

(iii) C + O2 → CO2

(iv) CH4 + 2O2 → CO2 + 2H2O

(c) (i) and (ii)

The answer is (b) (ii) only

Here, Sodium and Barium are displaced from each other’s salts, hence it is a double displacement reaction.

8. Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride

(ii) sublimation of silver chloride

(iii) decomposition of chlorine gas from silver chloride

(iv) oxidation of silver chloride

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (iv) only

Answer is (a) (i) only

9. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by the liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction

(ii) It is an exothermic reaction

(iii) The pH of the resulting solution will be more than seven

(iv) The pH of the resulting solution will be less than seven

The answer is (b) (ii) and (iii)

When solid calcium oxide reacts vigorously with water, it forms calcium hydroxide, which is accompanied by the generation of heat. This event proves the reaction is exothermic. The pH of the solution will be more than 7 because oxides and hydroxides of metals are alkaline.

10. Barium chloride, on reacting with ammonium sulphate, forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction

(c) (iv) only

Answer is (d) (ii) and (iv)

Ammonium and barium are getting displaced from their respective salts. Hence this is a double displacement reaction.  It is also called a precipitation reaction due to the formation of white precipitate of barium sulphate.

11. Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

Answer is (b) 2:1

1 Mole of water has 2 moles of Hydrogen and 1 mole of water. Hence mole ration between hydrogen and oxygen is 2:1.

12. Which of the following is(are) an endothermic process(es)?

(i) Dilution of sulphuric acid

(ii) Sublimation of dry ice

(iii) Condensation of water vapours

(iv) Evaporation of water

(a) (i) and (iii)

(b) (ii) only (c)

Change of solid to gas or liquid to gas absorbs heat hence sublimation of dry ice and evaporation is an endothermic reaction.

13. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity, if lead nitrate is not available, which of the following can be used in place of lead nitrate?

(a) Lead sulphate (insoluble)

(b) Lead acetate

(c) Ammonium nitrate

(d) Potassium sulphate

The answer is (b) Lead acetate

To get lead iodide we need a compound containing lead hence Ammonium nitrate and Potassium sulphate are ruled out. Lead sulphate is insoluble hence it cannot be used so the answer is (b) Lead acetate

14. Which of the following gases can be used for storage of fresh sample of an oil for a long time?

(a) Carbon dioxide or oxygen

(b) Nitrogen or oxygen

(c) Carbon dioxide or helium

(d) Helium or nitrogen

The answer is (d) Helium or nitrogen

Oxygen cannot be used as it is an oxidizing agent. Helium can be used as it is an inert gas. Nitrogen is less reactive and it is cheaper than Helium. In most cases, nitrogen is used in packet to prevent rancidity.

15. The following reaction is used for the preparation of oxygen gas in the laboratory

Which of the following statement(s) is(are) correct about the reaction?

(a) It is a decomposition reaction and endothermic in nature

(b) It is a combination reaction

(c) It is a decomposition reaction and accompanied by the release of heat

(d) It is a photochemical decomposition reaction and exothermic in nature

Answer is (a) It is a decomposition reaction and endothermic in nature

Potassium chlorate decomposes to give potassium chloride and oxygen. This is a decomposition reaction which is endothermic in nature.

16. Which one of the following processes involves chemical reactions?

(a) Storing of oxygen gas under pressure in a gas cylinder

(b) Liquefaction of air

(c) Keeping petrol in a china dish in the open

(d) Heating copper wire in the presence of air at high temperature

The answer is (d) Heating copper wire in the presence of air at a high temperature

Explanation :

In first three options given here, there is no involvement of chemical reaction. When copper is heated in the presence of air at high-temperature copper undergoes oxidation reaction to give out copper oxide.

17. In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

At room temperature hydrogen and oxygen are gases while water is liquid in nature hence option c) represents correct states of reactants and products.

18. Which of the following are combination reactions?

• \(\begin{array}{l}2 \mathrm{KClO} 3 \stackrel{\text { heat }}{\longrightarrow} 2 \mathrm{KCl}+30_{2}\end{array} \)
• \(\begin{array}{l}\mathrm{MgO}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Mg}(\mathrm{OH})_{2}\end{array} \)
• \(\begin{array}{l}4 \mathrm{Al}+3 \mathrm{O}_{2} \longrightarrow 2 \mathrm{Al}_{2} \mathrm{O}_{3}\end{array} \)
• \(\begin{array}{l}\mathrm{Zn}+\mathrm{FeSO}_{4} \longrightarrow \mathrm{ZnSO}_{4}+\mathrm{Fe}\end{array} \)

(c) (ii) and (iv)

Answer is (d) (ii) and (iii)

Here, two reactants react to form a single product hence option ii) and iii) represents combination reactions

Short Answer Questions

19. Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.

(a) Nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773K to form ammonia gas.

(b) Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.

(c) Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated H 2 SO 4 .

(d) Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.

Option (a) is a combination reaction.

Option (b) is a neutralisation reaction between a strong base and a weak acid.

Option (c) is a neutralisation reaction and double displacement reaction.

Option (d) is an example of an oxidation reaction.

20. Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.

(a) Thermite reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.

(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.

(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

(a) Thermit reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide. FE 2 O 3 + 2Al → Al 2 O 3 (s)+ 2Fe (l)

This is a Single displacement reaction

(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride. 3 Mg(s)+ N 2 → Mg 3 N 2

The reaction is a Combination reaction

(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine. Cl 2 (g)+2KI (aq) → 2KCl(Aq) +I 2 (s)

C 2 H 5 OH+ 3O 2 → 2CO 2 + 3H 2 O+ heat

This is a Combustion reaction

21. Complete the missing components/variables given as x and y in the following reactions

(a) Pb(NO3 ) 2 (aq) + 2KI(aq) → PbI2 (x) + 2KNO3 (y)

(b) Cu(s) + 2Ag NO3 (aq) → Cu(NO3 ) 2 (aq) + x(s)

(c) Zn(s) + H2 SO4 (aq) → ZnSO4 (x) + H2 (y)

(d) CaCO3 (s) →x CaO(s) + CO2 (g)

(a) Pb(NO3 ) 2 (aq) + 2KI(aq) → PbI2 (s) + 2KNO3 (aq)

(b) Cu(s) + 2Ag NO3 (aq) → Cu(NO3 ) 2 (aq) + 2Ag (s)

(c) Zn(s) + H2 SO4 (aq) → ZnSO4 (aq) + H2 (g)

(d) CaCO3 (s) → heat → CaO(s) + CO2 (g)

• x(s), y (aq)
• x-(aq) y(g)

22. Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dissolution of sodium hydroxide in water

(d) Dissolution of ammonium chloride in water

Exothermic reactions

Endothermic reaction

a) Decomposition of ferrous sulphate

23. Identify the reducing agent in the following reactions

(a) 4NH3 + 5O2 → 4NO + 6H2O

(b) H2O + F2 → HF + HOF

(c) Fe2O3 + 3CO → 2Fe + 3CO2

(d) 2H2 + O2 → 2H2O 

• NH 3- Ammonia
• H 2 O – Water
• CO-Carbon momnoxide
• H2- Hydrogen

24. Identify the oxidising agent (oxidant) in the following reactions

(a) Pb3O4 + 8HCl → 3PbCl2 + Cl2 + 4H2O

(b) 2Mg + O2 → 2MgO

(c) CuSO4 + Zn → Cu + ZnSO4

(d) V2O5 + 5Ca → 2V + 5CaO

(e) 3Fe + 4H2O → Fe3O4 + 4H2

(f) CuO + H2 → Cu + H2O

25. Write the balanced chemical equations for the following reactions

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.

(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu2 I2 ), liberates iodine gas and also forms potassium sulphate.

(a) Na 2 CO 3  + HCl → NaCl + NaHCO 3

(b) NaHCO 3  + HCl → NaCl + H 2 O + CO 2

(c) 2CuSO4+4Kl →2K2SO4+CU2I2+I2

26. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of chemical reaction?

KCl (aq)  + AgNO 3(aq)  → AgCl (s)  + KNO 3(aq)

This is a double displacement and precipitation reaction.

27. Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

2FeSO4=Fe2O3+SO2+SO3

This is a decomposition reaction.

28. Why do fireflies glow at night?

Fireflies produce a chemical reaction inside their bodies which allows them to glow at night. Oxygen combines with calcium, ATP and luciferin in the presence of an enzyme called luciferase.  This results in bioluminescence .

29. Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?

Grapes on the plant do not ferment because of the defence mechanism of plants. When grapes are plucked from the plant, grapes react with yeast to carry out fermentation. Here, sugar changes to alcohol and it is a chemical change.

30. Which among the following are physical or chemical changes?

(a) Evaporation of petrol

(b) Burning of Liquefied Petroleum Gas (LPG)

(c) Heating of an iron rod to red hot.

• (d) Curdling of milk

(e) Sublimation of solid ammonium chloride

Physical changes

• Evaporation of petrol
• Heating of an iron rod to red hot.
• Sublimation of solid ammonium chloride

Chemical changes

• Burning of Liquefied Petroleum Gas (LPG)

31. During the reaction of some metals with dilute hydrochloric acid, the following observations were made.

(a) Silver metal does not show any change

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(c) The reaction of sodium metal is found to be highly explosive

• Some bubbles of gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

• There will not be any reaction between silver and dilute HCL as silver lies in low reactive series of metals.
• Because it is an exothermic reaction temperature increases
• Sodium is highly reactive metals it reacts with atmospheric oxygen to form exothermic reaction which results in temperature increase.
• When lead reacts with acid it produces Hydrogen gas which is responsible for the formation of bubbles.

32. A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.

Compound X is Calcium oxide. CaO is extensively used in the cement industry. On treatment with water, CaO produces Ca(OH) 2 which is alkaline in nature and turns red litmus to blue colour.

Ca +H2O→ Ca(OH) 2

33. Write a balanced chemical equation for each of the following reactions and also classify them.

(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

(c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas.

(d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

(a) Pb(CH 3 COO) 2  + 2HCI – PbCl 2  + CH 3 COOH

This is a Double Displacement reaction.

(b) 2Na + 2C 2 H 5 OH + 2C 2 H 5 ONa+ H 2

This is a Displacement reaction.

(c) Fe2O 3  + 3CO + 2Fe + 3CO 2

This is a redox reaction.

(d) 2 H2S+O 2  → 2 s + 2 H 2 O

This is a replacement reaction.

34. Why do we store silver chloride in dark coloured bottles?

Silver chloride decomposes into silver and chlorine gas when exposed to sunlight. Hence Silver chloride is stored in dark coloured bottles.

35. Balance the following chemical equations and identify the type of chemical reaction.

(a) Mg(s) + Cl2 (g) → MgCl2 (s)

(b) HgO(s) → Heat Hg(l) + O2 (g)

(c) Na(s) + S(s) → Fuse Na2S(s)

(d) TiCl4 (l) + Mg(s) → Ti(s) + MgCl2 (s)

(e) CaO(s) + SiO2 (s) → CaSiO3 (s)

(f) H2O2 (l) → U V H2O(l) + O2 (g)

(a) Mg(s) + Cl 2 (g) → MgCl 2 (s)

This type of reaction is called a combination reaction or a synthesis reaction.

(b) 2HgOis) — (Heat) → 2 Hg(I) + O 2 (g)

This is an example of thermal decomposition reaction.

(c) 2Na(s) + S(s) — (Fuse) → Na 2 S(s)

This is an example of a Combination reaction.

(d) TiCI 4  (1) + Mg(s) → Ti(s) + 2MgCl 2  (s)

This reaction falls under the category of Displacement reactions

(e) Cao(s) + SIO 2 (s) + CaSIO 3 (s)

This is a synthesis reaction.

(f) 2H 2 O 2  (I) — UV → 2H 2 O(I) + O 2  (g)

36. A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.

(a) Write the chemical formulae of X and Y.

(b) Write a balanced chemical equation, when X is dissolved in water.

2Mg + O₂ →2MgO

If Magnesium Oxide is dissolved in water, the product is Magnesium Hydroxide

MgO  + H₂O → Mg(OH)₂

37. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?

Zinc is more reactive than copper as Zinc is placed above Hydrogen and Copper is placed below hydrogen in the activity series of metals. Because of this Zinc reacts with HCl whereas Copper will not react.

38. A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. (a) Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved. (b) Name the black substance formed and give its chemical formula.

• Silver reacts with H2S present in the atmosphere to form a black colour compound Silver Sulphide. This phenomenon is called corrosion.
• The black colour compound formed is Silver Sulphide

2Ag+ H 2 S →Ag 2 S+H 2

Long Answer Questions

39. On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed

(a) Write a balanced chemical equation of the reaction.

(b) Identity the brown gas X evolved.

(c) Identify the type of reaction.

(d) What could be the pH range of aqueous solution of the gas X?

(b) The brown gas X is nitrogen dioxide, NO2.

(c) The reaction involved is Thermal decomposition.

(d) pH< 7 because NO2 dissolves in water to form acidic solution (pH range below 7).

40. Give the characteristic tests for the following gases

• Pass CO 2 into limewater which will turn water into milky. This is the confirmation test for the presence of Carbon-di-oxide.
• The smell is the characteristic feature of SO 2 , which smells like a rotten egg.
• Test for oxygen involves burning of match stick near oxygen makes it burn even more brightly.
• When a burning matchstick is brought near H 2 gas, the flame burns with the pop sound. This is the test to confirm Hydrogen gas.

41. What happens when a piece of

(a) zinc metal is added to copper sulphate solution?

(b) aluminium metal is added to dilute hydrochloric acid?

(c) silver metal is added to copper sulphate solution?

Also, write the balanced chemical equation if the reaction occurs

a) When Zinc is added to copper sulphate solution Zinc displaces copper to form Zinc sulphate.

Zn(s)+ CuSo 4( aq)→ ZnSo4(aq)+ Cu(s)

b)Aluminium metals react with dilute HCl to form Aluminum Chloride and Hydrogen gas is evolved in the reaction.

2Al (s)+ 6HCl(aq)→ 2AlCl 3 (aq)+ 3 H 2

c)When silver metal is added to Copper Sulphate solution there will not be any reaction as silver is non-reactive metal.

42. What happens when zinc granules are treated with a dilute solution of H 2 SO4, HCl, HNO 3 , NaCl and NaOH, also write the chemical equations if a reaction occurs.

When Zinc granules react with dil H 2 SO 4 displacement reaction takes place leading to the formation of ZnSo 4 liberating H2 gas

Zn( s)+ H 2 SO 4 (aq)→ ZnSo 4 (aq)+H 2 (g)

When Zinc granules react with dil HCl displacement reaction takes place leading to the formation of ZnCl 2 liberating H2 gas

Zn( s)+ H 2 Cl(aq) →ZnCl 2 (aq) + H 2 (g)

When Zinc granules react with dil HNO 3  it leads to the formation of Zinc nitrate evolving H2O and nitrous oxide

4Zn(s)+10 HNO 3 (aq) 4Zn(NO 3 ) 2 (aq) +5H2O(i)+N 2 O (g)

When Zinc granules react with NaCl there will not be any reaction

When Zinc granules react with NaOH solution

Zn(s)+ NaOH(aq)→ Na 2 ZnO 2 (aq)+H 2 (g)

43. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, a white precipitate is obtained.

(a) Write a balanced chemical equation of the reaction involved

(b) What other names can be given to this precipitation reaction?

(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

a)On adding a drop of Barium Chloride solution to an aqueous solution of sodium sulphite, barium sulphite is obtained which is white colour precipitate.

BaCl2 + Na2SO3——>BaSO3 + 2NaCl

b) In this case, the precipitation reaction is a double displacement.

c) When we add dilute HCl to this reaction mixture Barium chloride, Sulphur dioxide and water are formed. Barium chloride is a soluble substance which will make the white precipitate disappear.

BaSO3 + HCl→ BaCl3 + SO2 + H2O.

44. You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO3, ZnCl2 and H2O. In which of the above containers can these solutions be kept?

These solutions can be kept in a copper container because copper is a noble metal which will not react with HCl or even HNO 3. If we keep the solution in an aluminium container, aluminium reacts with acids to form Zinc chloride.

Water can be stored in either copper or aluminium as they both do not react with copper.

NCERT Exemplar Class 10 Science Chemical Reactions

The NCERT Exemplar Solutions for Class 10 Science Chapter 1, Chemical Reactions and Equations, contain all types of questions, which include MCQs, fill in the blanks, match the following, etc. Chemical reactions are a very fundamental topic, which will help students in their future studies. Hence, they are advised to study this chapter thoroughly.

Important Topics of Class 10 Chapter 1 Science Chemical Reactions and Equations

Students are also advised to solve the CBSE previous years’ question papers as well as the sample papers. Solving the sample papers and CBSE previous year papers will help them to get familiar with the exam pattern as well as the marking scheme.

Frequently Asked Questions on NCERT Exemplar Solutions for Class 10 Science Chapter 1

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