test assignment for class 12

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Class 12 Assignments Download Pdf

Please refer to Assignments for Class 12 for all subjects given below. We have given below free printable Assignments for Class 12 for easy and free download in PDF. The assignments have been developed based on the current year’s NCERT Books for Class 12. These Assignments for Grade 12 cover all critical topics which can come in your standard 12 class tests and exams. Free printable Assignments for CBSE Class 12 , school and class worksheets, and practice test papers have been developed by our experienced class 12 teachers. You can free download CBSE NCERT printable assignments for Class 12 with solutions and answers. All assignments and test sheets have been prepared by expert faculty as per the latest curriculum in Class 12. Students can simply click on the links below and download all Pdf assignments for class 12 for free. Latest Kendriya Vidyalaya Class 12 assignments and test papers are provided below.

Assignments for Class 12 Pdf Download

We have provided the largest collection of free CBSE NCERT KVS Assignments for Class 12 . You can download all free assignments in Pdf for standard 12th. Our expert faculty members have covered Class 12 questions and answers for all subjects as per the latest curriculum for the current academic year. All practice test papers and question banks for Class 12 subjects and CBSE Assignments for Class 12 will be really useful for students to properly prepare for the upcoming exams. Class 12th students are advised to free download in Pdf all printable question banks given below.

Subjectwise Assignments for Class 12 for Download in Pdf

Advantages of Solving Class 12 Assignments

• By clicking on the links above you can access the largest collection of assignments for Grade 12, you will be able to find critical and scoring questions which can come in your exams and school tests.
• While you do the assignments, it is also important to go through all your CBSE textbooks for Class 12 .
• All assignments for standard 12 for all subjects have solutions and step by step answers. Students and parents will be able to understand then easily.
• Class 12 students who are currently studying in CBSE, NCERT and KVS schools will be able to easily download subjectwise and chapterwise worksheets and assignments in Pdf
• Class 12 practice question banks will help to further strengthen subject understanding which will help to score better rank in exam

FAQs by Students in Class 12

At https://www.cbsencertsolutions.com, we have provided the biggest database of free assignments for Class 12 which you can download in Pdf

We provide here Standard 12 subject-wise assignments which can be easily downloaded in Pdf format for free. Our teachers have provided these Grade 12 test sheets for all subjects given in your books.

You can click on the links above and get assignments for all subjects in Grade 12, all subject and topic-wise question banks with solutions have been provided here. You can click on the links to download in Pdf.

We have provided here subject-wise Grade 12 question banks, revision notes and questions for all difficult topics, and other study material. You can download it all without any charge by clicking on the links provided above.

We have provided the best quality question bank for Class 12 for all subjects. You can download them all and use them offline without the internet.

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CBSE Test Papers | Printable Worksheets | Chapter wise Tests

Selective study vs comprehensive study.

Selective study means learning some selected scoring topics with the help of some selected resources. For example, we have the chapter probability that carries 8 marks but there are only two exercises, and students will select it for study because with less effort they can score more. Another example is, that students will do only some selected questions from the whole exercise and then try to attempt 4-5 CBSE Sample Papers only. 

Comprehensive study means learning not only for marks but for understanding as well. Here, the focus will be on understanding the concepts in a comprehensive manner and students will attempt all the questions from all the chapters. They won't rely on a few model papers but they will study every topic thoroughly. 

Why you should not rely on Sample Papers?

We noticed that most of the students feel that if they will practice 8-10 sample papers, they will get most of the questions in exams from these papers only. But it is the biggest mistake. It never happens. 

Even few publishers provide guess papers. They claim that the actual question paper will have the same or similar questions. Again, it never happens. Such selective approaches are always misleading and finally harm the student. 

What is the purpose of Sample Papers then?

Sample papers are meant for practicing questions in an exam-like environment. Here students is having the same number of questions, same difficulty level and same timeframe to complete the test. This helps the students gain confidence and get ready for the actual exam. 

With the help of sample papers students:

• Learn to complete the exam within a given time duration.
• Understand what to write, how to write and how much to write.
• Get an idea about the difficulty level of the questions.
• Analyze weak areas and make a strategy to practice them.

Test Papers Vs Sample Papers

As discussed Test papers belong to a particular chapter only. In other words, these are chapter tests. On the other hand, sample papers are full syllabus tests. It includes questions from the whole syllabus.

Why Test Papers are Recommended?

You can not practice sample papers from day 1 of your academic session. You should go for it only when the whole syllabus is completed. So, what to do when only one chapter is done and you want to check your performance? You will obviously choose chapter tests that are Test Paper we are talking about. 

CBSE Chapter-wise Test Papers

CBSE Test Papers are chapter-wise tests with complete solutions. Students must attempt the test papers as soon as one chapter is completed in their class. This will certainly help them to get a better understanding of the areas where improvement is required. 

We at myCBSEguide provide CBSE chapter-wise test papers with solution and answer keys for CBSE class-9, CBSE class-10, CBSE class-11 and CBSE class-12. We have included questions from CBSE practice papers, unit tests and internal assessments in these test papers. 

Printable Worksheets & Assignments

CBSE printable worksheets for classes 3 to 8 with answers are also available for download on the myCBSEguide App or Student Dashboard . In junior classes, students need continuous practice. They must be given worksheets to attempt at regular intervals for longer retention of concepts. These worksheets are designed in such a manner that all the important concepts and learning outcomes are covered so that the child will not miss anything.

CBSE Test Papers for Class 12

CBSE chapter-wise test papers with solutions are provided here for free download in PDF format. These test papers include NCERT questions, board exam questions and important questions asked in various class tests and unit tests. CBSE test papers and solutions in Physics, Chemistry, Maths and Biology for class 12 are given below. 

Class 12 Chapter Tests

• CBSE Test Papers for class-12 Physics
• CBSE Test Papers for Class-12 Chemistry
• CBSE Test Papers for Class-12 Mathematics
• CBSE Test Papers for Class-12 Biology

CBSE Test Papers for Class 11

CBSE class-11 test papers for practice in Maths, Chemistry, Biology and Physics with complete solutions are given under this download. CBSE practice papers for each and every chapter in class XI are included in this section. The practice papers are prepared by a team of expert teachers for CBSE students. Each test paper has 10-12 questions with a solution and answer keys.

Class 11 Chapter Tests

• CBSE Test Papers for class-11 Physics
• CBSE Test Papers for Class-11 Chemistry
• CBSE Test Papers for Class-11 Mathematics
• CBSE Test Papers for Class-11 Biology

CBSE Test Papers for Class 10

CBSE practice papers and chapter-wise test papers with solutions for class-10 are enlisted here for free download. The practice papers comprise all important questions from the textbooks. It includes questions from previous year's board papers and NCERT textbooks. 

Class 10 Chapter Tests

• CBSE Test Papers for Class 10 Mathematics
• CBSE Test Papers for Class 10 Science
• CBSE Test Papers for Class 10 Social Science
• CBSE Test Papers for Class 10 English Language & Literature
• CBSE Test Papers for Class 10 Hindi A
• CBSE Test Papers for Class 10 Hindi B

CBSE Test Papers for Class 9

Practice papers for class IX with solutions are provided here for free download. There are around 4-5 test papers from each chapter with 10-12 questions in each test. It includes VSA, SA and LA questions with proper explanations and examples. All the answers follow the standard blueprint and marking scheme issued by CBSE, New Delhi.

Class 9 Chapter Tests

• CBSE Test Papers for Class 9 Mathematics
• CBSE Test Papers for Class 9 Science
• CBSE Test Papers for Class 9 Social Science
• CBSE Test Papers for Class 9 English Language & Literature
• CBSE Test Papers for Class 9 Hindi A
• CBSE Test Papers for Class 9 Hindi B

Printable Worksheets for CBSE Class 8

Worksheets for class-8 Maths and science in printable format are given in this section for free download. There are around 60-70 worksheets with answer keys in each subject. The worksheets include all types of questions such as fill-ups, matching questions, true-false questions, MCQ and descriptive questions. These CBSE printable worksheets cover the whole syllabus as issued by CBSE. 

Class 8 Worksheets

• Printable Worksheets for CBSE Class 8 Mathematics
• Printable Worksheets for CBSE Class 8 Science
• Printable Worksheets for CBSE Class 8 Social Science
• Printable Worksheets for CBSE Class 8 English
• Printable Worksheets for CBSE Class 8 Hindi

Printable Worksheets for CBSE Class 7

Printable worksheets for class-7 Maths and Science include Integers, Fractions and Decimals, Data Handling, Simple Equations, Lines and Angles, The Triangle and its Properties, Congruence of Triangles, Comparing Quantities, Rational Numbers, Practical Geometry, Perimeter and Area, Algebraic Expressions, Exponents and Powers, Symmetry, Visualizing Solid Shapes in Maths and  Nutrition in Plants, Nutrition in Animals, Fibre to Fabric, Heat, Acids Bases and Salts, Physical and Chemical Changes, Weather Climate and Adaptations of Animals to Climate, Winds Storms and Cyclones, Soil, Respiration in Organisms, Transportation in Animals and Plants, Reproduction in Plants, Motion and Time, Electric Current and its Effects, Light, Water A Precious Resource, Forests Our Lifeline, Wastewater Story in science. 

Class 7 Worksheets

• Printable Worksheets for CBSE Class 7 Mathematics
• Printable Worksheets for CBSE Class 7 Science
• Printable Worksheets for CBSE Class 7 Social Science
• Printable Worksheets for CBSE Class 7 English
• Printable Worksheets for CBSE Class 7 Hindi

Printable Worksheets for CBSE Class 6

CBSE Printable worksheets in class-VI maths include Knowing our Numbers, Whole Numbers, Playing with Numbers, Basic Geometrical Ideas, Understanding Elementary Shapes, Integers, Fractions, Decimals, Data Handling, Mensuration, Algebra, Ratio and Proportion, Symmetry, Practical Geometry and class-VI Science includes  Food-Where does it Come From, Components of Food, Fibre to Fabric, Sorting Materials into Groups, Separation of Substances, Changes around Us, Getting To Know Plants, Body Movements, The Living Organisms and Their Surroundings, Motion and Measurement of Distances, Light Shadows and Reflections, Electricity and Circuits, Fun with Magnets, Water, Air around Us, Garbage in Garbage out.

Class 6 Worksheets

• Printable Worksheets for CBSE Class 6 Mathematics
• Printable Worksheets for CBSE Class 6 Science
• Printable Worksheets for CBSE Class 6 Social Science
• Printable Worksheets for CBSE Class 6 English
• Printable Worksheets for CBSE Class 6 Hindi

Printable Worksheets for CBSE Class-5

In primary classes, the importance of worksheets is well known. It is the best tool to evaluate the learning process of the child. Small worksheets with 10-12 questions from a particular topic are given to students for concept-based evaluation. We have prepared these worksheets to evaluate the child concept by concept. The printable worksheets for class V maths and science are available here for free download in PDF format. 

Class 5 Worksheets

• Printable Worksheets for CBSE Class 5 Mathematics
• Printable Worksheets for CBSE Class 5 EVS

Printable Worksheets for CBSE Class 4

CBSE worksheets for class 4 EVS (Science and Social Science) in  Plants and animals, Habitats, Air and Water, Our Environment, Our Food, Human body and Health, State of Matter, WorkForce and Energy, Our Universe, India Our Country, Our Natural Resources, Map and Directions, Land and People of India, Indian Government, Means of Transport, Means of communication, Things we make and do. Class-IV Maths includes  Number systems, Addition and subtraction, multiplication and division, Factors Multiples Estimation, Patterns and symmetry, Fractional Numbers, Decimal Numbers, Geometrical Shapes, Measurement, Money, Time and calendar, and Data Handling.

Class 4 Worksheets

• Printable Worksheets for CBSE Class 4 Mathematics
• Printable Worksheets for CBSE Class 4 EVS

Printable Worksheets for CBSE Class 3

CBSE Worksheets for class-3 include Number System, Addition, Subtraction, Multiplication, Division, Fractional Numbers, Time, Measurement, Geometry, Pattern And Symmetry, Money, Data Handling in Maths and  Things around Us, World of Plants, World of Animals, Air and Water, Human Body and Health, Foods we eat, Clothes and dresses, Festivals, Works around Us, Our helpers, Means of Communications, Means of Transport, India Our County, Earth is our Home in science.

Class 3 worksheets

• Printable Worksheets for CBSE Class 3 Mathematics
• Printable Worksheets for CBSE Class 3 EVS

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Assignments Class 12 Pdf Download

Students can refer to Assignments for Class 12 for all subjects available for download in Pdf. We have given below links to subject-wise free printable Assignments for Class 12 which you can download easily. All assignments have a collection of questions and answers designed for all topics given in your latest NCERT Books for Class 12 for the current academic session. All Assignments for Grade 12 have been designed by expert faculty members and have been designed based on the type of questions asked in standard 12 class tests and exams. All Free printable Assignments for NCERT CBSE Class 12, practice worksheets, and question banks have been designed to help you understand all concepts properly. Practicing questions given in CBSE NCERT printable assignments for Class 12 with solutions and answers will help you to further improve your understanding. Our faculty have used the latest syllabus for Class 12. You can click on the links below to download all Pdf assignments for class 12 for free. You can get the best collection of Kendriya Vidyalaya Class 12 assignments and questions workbooks below.

Class 12 Assignments Pdf Download

CBSE NCERT KVS Assignments for Class 12 have been provided below covering all chapters given in your CBSE NCERT books. We have provided below a good collection of assignments in Pdf for standard 12th covering Class 12 questions and answers for all subjects. These practice test papers and workbooks with question banks for Class 12 all subjects and free CBSE Assignments for Class 12 are really beneficial for you and will support in preparing for class tests and exams. Standard 12th students can download in Pdf by clicking on the links below.

Subjectwise Assignments for Class 12

Assignments class 12 mathematics   as per cbse and ncert pattern.

Benefits of Solving Class 12 Assignments

• The best collection of Grade 12 assignments for all subjects have been provided below which will help you in getting better marks in class tests and exams.
• The solved question for Class 12 all subjects will help you to gain more confidence to attempt all types of problems in exams
• Latest NCERT Books for Class 12 have been referred to for designing these assignments
• We have provided step by step solutions for all questions in the Class 12 assignments so that you can understand the solutions in detail.
• We have provided single click download links to all subjectwise and chapterwise worksheets and assignments in Pdf.
• Class 12 practice question banks will support to enhance subject knowledge and therefore help to get better marks in exam

FAQs by Students in Class 12

At https://www.ncertbooksolutions.com is the best website that has the biggest collection of free printable assignments for Class 12.

We provide here Standard 12 subject-wise assignments which can be easily downloaded in Pdf format for free. Our teachers have provided these Grade 12 test sheets for all subjects given in your books.

You can click on the links above and get assignments for all subjects in Grade 12, all subject and topic-wise question banks with solutions have been provided here. You can click on the links to download in Pdf.

We have provided here subject-wise Grade 12 question banks, revision notes and questions for all difficult topics, and other study material. You can download it all without any charge by clicking on the links provided above.

We have provided the best quality question bank for Class 12 for all subjects. You can download them all and use them offline without the internet.

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CBSE Worksheets for Class 12 History

CBSE Worksheets for Class 12 History: One of the best teaching strategies employed in most classrooms today is Worksheets. CBSE Class 12 History Worksheet for students has been used by teachers & students to develop logical, lingual, analytical, and problem-solving capabilities. So in order to help you with that, we at WorksheetsBuddy have come up with Kendriya Vidyalaya Class 12 History Worksheets for the students of Class 12. All our CBSE NCERT Class 12 History practice worksheets are designed for helping students to understand various topics, practice skills and improve their subject knowledge which in turn helps students to improve their academic performance. These chapter wise test papers for Class 12 History will be useful to test your conceptual understanding.

Board: Central Board of Secondary Education(www.cbse.nic.in) Subject: Class 12 History Number of Worksheets: 24

CBSE Class 12 History Worksheets PDF

All the CBSE Worksheets for Class 12 History provided in this page are provided for free which can be downloaded by students, teachers as well as by parents. We have covered all the Class 12 History important questions and answers in the worksheets which are included in CBSE NCERT Syllabus. Just click on the following link and download the CBSE Class 12 History Worksheet. CBSE Worksheets for Class 12 History can also use like assignments for Class 12 History students.

• CBSE Worksheets for Class 12 History Assignment 1
• CBSE Worksheets for Class 12 History Assignment 2
• CBSE Worksheets for Class 12 History Assignment 3
• CBSE Worksheets for Class 12 History Assignment 4
• CBSE Worksheets for Class 12 History Assignment 5
• CBSE Class 12 History Revision Sheet – 1
• CBSE Class 12 History Revision Sheet – 2
• CBSE Class 12 History Revision Sheet – 3
• CBSE Class 12 History Revision Sheet – 4
• CBSE Class 12 History Revision Sheet – 5

CBSE Class 12 History Study Material

• CBSE Class 12 History Through The Eyes Of Travellers Perceptions Of Society
• CBSE Class 12 History Understanding Partition Politics Memories Experiences
• CBSE Class 12 History An Imperial Capital Vijay Nagar
• CBSE Class 12 History Bricks Beads Bones Harappan Civilization
• CBSE Class 12 History Changes in Religious Beliefs Devotional Texts
• CBSE Class 12 History Colonial Cities Urbanization Planning Architecture
• CBSE Class 12 History Colonialism and Countryside Exploring official
• CBSE Class 12 History Framing Constitution Beginning Of New Era
• CBSE Class 12 History Kings Chronicles Mughal Courts
• CBSE Class 12 History Kings Farmers Towns Early States Economies
• CBSE Class 12 History Kinship Caste and Class Early Societies
• CBSE Class 12 History Peasant Zamindar State Agrarian Society Mughal Empire
• CBSE Class 12 History Rebels The Raj 1857 Revolt Representations
• CBSE Class 12 History Thinkers Beliefs and Buildings Cultural Developments

Advantages of CBSE Class 12 History Worksheets

• By practising NCERT CBSE Class 12 History Worksheet , students can improve their problem solving skills.
• Helps to develop the subject knowledge in a simple, fun and interactive way.
• No need for tuition or attend extra classes if students practise on worksheets daily.
• Working on CBSE worksheets are time-saving.
• Helps students to promote hands-on learning.
• One of the helpful resources used in classroom revision.
• CBSE Class 12 History Workbook Helps to improve subject-knowledge.
• CBSE Class 12 History Worksheets encourages classroom activities.

Worksheets of CBSE Class 12 History are devised by experts of WorksheetsBuddy experts who have great experience and expertise in teaching Maths. So practising these worksheets will promote students problem-solving skills and subject knowledge in an interactive method. Students can also download CBSE Class 12 History Chapter wise question bank pdf and access it anytime, anywhere for free. Browse further to download free CBSE Class 12 History Worksheets PDF .

Now that you are provided all the necessary information regarding CBSE Class 12 History Worksheet and we hope this detailed article is helpful. So Students who are preparing for the exams must need to have great solving skills. And in order to have these skills, one must practice enough of Class 12 History revision worksheets . And more importantly, students should need to follow through the worksheets after completing their syllabus.  Working on CBSE Class 12 History Worksheets will be a great help to secure good marks in the examination. So start working on Class 12 History Worksheets to secure good score.

CBSE Worksheets For Class 12

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Lesson Plan Maths Class XII | For Maths Teacher

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Class 12 Chemistry Answer Key 2024 Out, For Set 1, 2, 3

Students can match their answers with the most accurate CBSE Class 12 Chemistry Answer Key 2024 prepared by the expert facilities of Adda247. Get CBSE Chemistry Class 12 Question Paper Set 1, 2, 3.

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Chemistry Answer key 2024

The Central Board of Secondary Education has successfully conducted the CBSE Class 12 Chemistry Exam 2024 o n 27 February 2024. The chemistry paper was concluded at 01:30 pm, As the completion of the examination we updated the CBSE Class 12 Chemistry Answer Key 2024 on this page. The students appearing in the examination can match their answers with the unofficial Class 12 Chemistry Answer Key 2024 prepared by the expert facilities of Adda247. 

Class 12 Chemistry Answer Key 2024

Here we have given the complete CBSE Class 12 Chemistry Answer Key 2024 along with Exam Analysis. In CBSE Class 12 Chemistry Answer Key & Exam Analysis, we will cover the difficulty level of the exam, out-of-syllabus questions, and mistakes in the question paper. CBSE Class 12 Chemistry Answer key 2024 is provided for all sections. Section A consists of 16 multiple-choice questions worth one mark each. Section B consists of five short answer questions worth two marks each. After completion of the CBSE Exam for the Chemistry subject, the students must match their responses with the Chemistry Answer Key provided on this page and must check the CBSE Class 12 Chemistry Exam Analysis.

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Answer Key Chemistry Class 12: Overview

CBSE Class 12 Chemistry Answer Key 2024 given on this page is error-free and all the answers are framed by the faculties who have years of experience in teaching Class 12 Chemistry. Below we have given the highlights of CBSE Answer Key Chemistry Class 12. The students must check the brief information of CBSE Class 12 Chemistry Answer Key 2024 provided in the table below.

CBSE Class 12 Chemistry Answer Key Set 1 (56/2/1)

SECTION A Questions no. I to 16 are Multiple Choice type Questions, carrying 1 mark each 16×1=16

1. When MnO2 is fused with KOH in air, it gives (A) KMnO4 (B) K2MnO4 (C) MngO7 (D) Mn2O Answer: (B) K2MnO4

2. Ligand EDTA is an example of a: (A) Monodentate ligand (B) Didentate ligand (C) Tridentate ligand (D) Polydentate ligand

Answer:(D) Polydentate ligand

3. Which of the following ligand forms chelate complex? (A) (CO2-) 4 (B) CI (C) NO (D) NH3

Answer:(A) CO 4

Answer: Option C

Answer: Option (d)

Answer: Option A

7. Ethanol on heating with conc, H₂SO₄ at 413 K gives: (A) C2H5OSO3H (B) C₂H-O-CH3 (C) C₂H-O-C2H5 (D) CH2=CH2 Answer:(C) C₂H-O-C2H5

8. An azeotropic solution of two liquids has boiling point lower than either of them when it : (A) is saturated (B) shows positive deviation from Raoult’s law (C) shows negative deviation from Raoult’s law (D) shows no deviation from Raoult’s law Answer:(B) shows positive deviation from Raoult’s law

9. The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0-0225. The mole fraction of the non-volatile solute is: (A) 0.80 (B) 0.725 (C) 0.15 (D) 0.0225 Answer: (D) 0.0225

10. During electrolysis of aqueous solution of NaCl: (A) H₂ (g) is liberated at cathode (B) Na is formed at cathode (C) O2 (g) is liberated at anode (D) Cl2 (g) is liberated at cathode

11. The addition of catalyst during a chemical reaction alters which of the following quantities of the reaction? (A) Enthalpy (B) Activation energy (C) Entropy (D) Internal energy

Answer: (B) Activation energy

12. For the elementary reaction PQ. the rate of disappearance of ‘P’ increases by a factor of 8 upon doubling the concentration of ‘P’. The order of the reaction with respect to ‘P’ is: (A) 3 (B) 4 (C) 2 (D) 1

Answer: (A) 3

For Questions number 13 to 16, two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

13. Assertion (A): Aliphatic primary amines can be prepared by Gabriel phthalimide synthesis. Reason (R): Alkyl halides undergo nucleophilic substitution with anion formed by phthalimide.

Answer:(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). 14. Assertion (A): Uracil base is present in DNA. Reason (R): DNA undergoes self-replication.

Answer: (D) Assertion (A) is false, but Reason (R) is true. 15. Assertion (A): Diazonium salts of aromatic amines are more stable than those of aliphatic amines. Reason (R): Diazonium salts of aliphatic amines show resonance.

Answer:(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). 16. Assertion (A): p-nitroaniline is a weaker base than p-toluidine. Reason (R): The electron withdrawing effect of NO2 group in p-nitroaniline makes it a weaker base.

Answer:(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Chemistry Set 2 Answer Key 2024: Paper Code (56/4/2)

3. Which alkyl halide Dom the given options will undergo a reaction

4.  Which of the following stids represents Vitamin C? (A) Banelusric acid (B) Gluconic acid (C) Ascorbic acid (D) Benzoic acid

6. Consider the following reaction

Identify A and B from the given options (A) A-Methanol. B-Potassium formate (B) A-Ethanol. B-Potassium formate (C) A-Methanal, 8-Ethanol (D) A-Methanol, B-Potassium acetate

Answer: (A) A-Methanol. B-Potassium formate

11. Nucleophilic addition of Grignard reagent to ketones followed by hydrolysis with dilute acids forms: (A) Alkene (C) Tertiary alcohol (B) Primary alcohol (D) Secondary alcohol

Answer: (C) Tertiary alcohol

12. Match the reagents required for the given reactions:

(A) 1-(г), П-(p), III-(s), IV(q) (B) 1-(q), II(r), III-(p). IV- (9) (C) 1-(8), II-(q). III-(p). IV(r) (D) 1-(p). II-(s), III-(r). IV- (q)

Answer: (A) 1-(г), П-(p), III-(s), IV(q)

Chemistry Set 3 Answer Key 2024: Paper Code  (56/3/3-13)

1. Which of the following ligands is an ambidentate ligand? (A) CO (B) SCN- (C) NH3 (D) H₂O

Answer: (B) SCN-

2. On adding AgNO3 solution to 1 mole of CoCl3. 4NH3, one mole of AgCl is precipitated. The secondary valency of Cois: (A) 6 (C) 3 (B) 4 (D) 7

Answer: (A) 6

3. Which of the following elements of 3d series of transition elements has the lowest   Δ a H°? (B) Cr (A) Sc (D) Zn (C) Cu

Answer: (D) Zn

Answer: Option B

6. CH3-O-CH3 when treated with excess HI gives: (A) CH3-OH + CH3-1 (B) 2CH3-OH (C) 2CH3-I (D) CH3-I+CH4

Answer:C) 2CH3-I

Which of the following compounds will not react with benzene sulphonyl chloride? (A) (C2H5)3N (B) C2H5-NH2 (C) (C2H5)2 NΗ (D)C6H5- NH2

Answer:(A) (C2H5)3N

6. Scurvy’ is caused by a deficiency of vitamins: (A) E (B) A (C) C (D) D Answer: (C) C

7. A 1% solution of solute ‘X’ is isotonic with a 6% solution of sucrose (molar mass = 342 g mol¹). The molar mass of solute ‘X’ is: (A) 34-2 g mol-1 (B) 57 g mol-1 (C) 114 g mol-¹ (D) 3-42 g mol 1

10. The half life of a first order reaction with rate constant (k) of 3 min-1 (A) 0.693 min (B) 2.31 min (C) 6.93 min (D) 0.231 min

Answer: (D) 0.231 min

11. Which of the following cells is used in hearing aids? (A) Dry cell (B) Mercury cell (C) Nickel-cadmium cell (D) Fuel cell Answer: (C) Nickel-cadmium cell 12. Aniline on reaction with Bromine water gives: (A) o-bromoaniline (B) 2,4,6-tribromoaniline (C) m-bromoaniline (D) p-bromoaniline

Answer: (B) 2,4,6-tribromoaniline

13. Assertion (A): AmixH and AmixV are zero for an ideal solution. Reason (R): The solution which obeys Raoult’s law over the entire range of concentration is called an ideal solution. Answer: (a)

14. Assertion (A): Rate of reaction decreases with increase in temperature. Reason (R): Number of effective collisions increases with increase in temperature.

Assertion (A): Phenol on reaction with aqueous NaOH gives sodium phenoxide. Reason (R): This reaction supports the acidic nature of phenol.

Asertion (A): Boiling point of butan-1-ol is higher than that of butan-1-amine. Reason (R): Being more polar, butan-1-ol intermolecular hydrogen bonds form stronger compared to as butan-1-amine.

CBSE Class 12 Chemistry Answer Key 2024 Set 1

SECTION – A (MCQs)

1. Van’t Hoff factor for K₂SO4 solution, assuming complete ionization is

(A) 1 (B) 3 (C) 13 (D) 2

Answer: (B) 3

5. The rate of a reaction increases sixteen times when the concentration of the reactant increases four times. The order of the reaction is

(A) 2.5 (B) 2.0 (C) 1.5 (D) 0.5

Answer: (B) 2.0

6. Which of the following cell is used in hearing aids?

(A) Mercury cell (B) H2-O2 fuel cell (C) Dry cell (D) Ni-Cd cell

Answer: (A) Mercury cell

7. Isotonic solutions have the same

(A) density (C) osmotic pressure (B) refractive index (D) volume

Answer: (C) osmotic pressure

8. Transition metals are known to make interstitial compounds. Formation of interstitial compounds makes the transition metal

(A) more hard (C) more ductile (B) more soft (D) more metallic

Answer: (A) more hard

9. Auto-oxidation of chloroform in air and light produces a poisonous gas known as

(A) Phosphine (C) Phosgene (B) Mustard gas (D) Tear gas

Answer: (C) Phosgene

10. Out of the following alkenes, the one which will produce tertiary butyl alcohol on acid catalysed hydration is

(A) CH3CH3CH=CH2 (B) CH3CH=CH2 (C) CH3-CH=CH-CH3 (D) (CH3)2C = CH2

Answer: (D) (CH3)2C = CH2

CBSE Class 12 Chemistry Answer key 2024 Set 3

Check out the solutions of paper code 56/5/3 section A Mcqs in the table below.

CBSE Class 12th Chemistry Answer key 2024 Set 1

Check out the solutions of paper code 56/1/1 section A Mcqs in the table below.

Class 12 Chemistry Answer Key 2024 & Paper Analysis

Watch the video to get the Class 12 Chemistry Exam Analysis at the earliest.

Answer Key of Chemistry Class 12 CBSE 2024 for Set 1,2,3

Here we will provide the CBSE Class 12 Chemistry Answer key 2024 for Chemistry question sets 1, 2 and 3. A majority of students said that Section A’s Multiple Choice questions are a little bit tricky and they found some difficulties while solving these sections. Candidates can cross-check their answers with the answer key of chemistry class 12 cbse 2024 of Section A.

CBSE Class 12 Chemistry Board Question Paper 2024 PDF

The CBSE Class 12 Chemistry Exam was conducted in multiple sets at different exam centers. Students should assess the difficulty level of the Chemistry Question paper sets that differ from their own. The board question paper has a weightage of 70 points and all questions are mandatory to attempt. Students can access CBSE 12 Chemistry question papers from various sets on this page.

Class 12 Chemistry Question Paper Analysis 2024

After the conclusion of the Exam, we talked to the students as well as the teachers to know the difficulty level of the Paper. Let’s check the test takers’ and subject experts’ reactions on the CBSE Class 12 Chemistry Exam below.

CBSE Class 12 Chemistry Paper Analysis by Students

According  to  general  reviews,  students  regarded  the  work  to  be  moderate  and  balanced.

• The paper was NCERT-based and covered all relevant topics.
• The MCQ component of the paper was a little challenging but workable. Section B was easy.
• The long-answer questions were straightforward, if fairly lengthy.
• The short-answer questions were moderately difficult.
• Organic chemistry is frequently the most difficult component of the exam. Students rated organic chemistry this year as moderate. Expected questions regarding conversions and name reactions were posed.

CBSE Class 12th Chemistry Exam Analysis by Teachers

Experts and educators have stated that the chemistry paper was balanced and of moderate difficulty.

• The majority of the questions were direct and based on NCERT. Almost all of the students found the CBSE Class 12 Chemistry paper to be fairly average.
• The paper pattern was consistent with the CBSE sample paper.
• The majority of the paper’s questions ranged from simple to moderate, except for a couple that could have been difficult for pupils.

Class 12 Chemistry Question Paper 2024 Pattern 

With calculating the scores with the CBSE Class 12 Chemistry Answer Key 2024 , students must know the Chemistry marking Scheme of Each section.  As per the CBSE Class 12 Chemistry sample paper, the CBSE Class 12 Chemistry question paper consists of Five sections. All the sections hold different marks and different types of questions. The board will ask the very short answer type, short answer type, and case-based questions in the CBSE Class 12 Chemistry Examination. Check out the detailed section-wise pattern listed below: 

1. Section A consists of 18 Questions carrying 1 mark each [Multiple Choice Questions]

2. Section B consists of 7 questions carrying 2 marks each [Very Short Answer Questions]

3. Section C consists of 5 questions carrying 3 marks each [Short Answer Questions]

4. Section D consists of 2 Questions carrying 4 marks each [Case Based Questons]

5. Section E consists of 2 Questions carrying 5 marks each [Long Answer Questions]

CBSE Class 12 Chemistry Answer Key Set 3 Last year

1, A compound CaCl2.6h2O undergoes complete dissociation in water, The Van’t Hoff Factor ‘i’ is:

a)  9, b) 6, c)3, d) . 4

Answer: c) 3

2. For a Zero order reaction of type A →products, the rate equation may be expressed as:

Answer: Option (a)

3. Which of the following Cu 2+ halide is not known?

Answer: Option (b)

Q4. Which of the following structures represents a-D-glucose?

Answer: (a)

• The compounds [Cr(H2O)lCl3, [Cr(H2O) Cl]C12. H2O and [Cr(H2O)4C12]Cl. 2H2O exhibit:

(a) Linkage isomerism (b) Geometrical isomerism (c) . Ionization isomerism (d) Hydrate isomerism

Answer: (d) Hydrate isomerism

• Which of the following alkenes on acid catalysed hydration gives a tertiary alcohol?

(a) 2-Butene

(b) 2-Methylpropene

(c) Propene

(d) 95 1-Butene

Answer: (b) 2-Methylpropene

• When nitrobenzene is heated with tin and concentrated HCl, the product formed is:

• The reaction of 1-phenyl-2-chloropropane with alcoholic KOH gives mainly:

(a) 1-phenylpropene

(b) 3-phenylpropene

(c) 1-phenylpropene 1-phenylpropan-3-ol

(d) 1-phenylypropan-2-ol

Answer: (a) 1-phenylpropene

• Corrosion of iron is:

(a) a decomposition process a photochemical process (b) a photochemical process (c) an electrochemical process (d) a reduction process

Answer: (a) reduction process

• The number of molecules that react with each other in an elementary reaction is a measure of the:

(a) activation energy of the reaction (b) order of the reaction (c) stoichiometry of the reaction (d) molecularity of the reaction

Answer: (d) molecularity of the reaction

11. On hydrolysis, which of the following carbohydrates gives glucose and galactose?

(a) Sucrose (c) Maltose (b) Lactose (d) Cellulose

Answer: (b) Lactose

12. The deficiency of which of the following vitamins causes ‘Rickets’?

(a) Vitamin A (b) Vitamin D (c) Vitamin B (d) Vitamin C

Answer; (b) Vitamin D

13. Which of the following is an ‘Acetal’?

Answer: (d)

For Questions number 15 to 18, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.

• Assertion (A): When NaCl is added to water, a depression in freezing point is observed.

Reason (R): The vapour pressure of solution is increased which causes depression in freezing point.

Answer:(c) Assertion (A) is true, but Reason (R) is false.

• Assertion (A): Monobromination of aniline can be conveniently done by protecting the amino group by acetylation.

Reason (R): Acetylation decreases the activating effect of the amino group.

Class 12 Chemistry Answer Key last Year

• The magnetic moment of [NiCl4]2-

(a) 1.82 BM (b) 2.82 BM (c) 4.42 BM (d) 5.46 BM (Atomic no : Ni= 28) Answer:  (a) 1.82 BM

• Which of the following cell was used in Apollo space programme?

(a) Mercury Cell

(b) Daniel Cell

(c) H2-O2 Fuel cell

(d) Dry Cell

Answer: (c) H2-O2 Fuel cell

• Which one of the following has lowest pKa value?

(a) CH3-COOH

(b) O2N-CH2-COOH

(c) Cl-CH2-COOH

Answer:  (b) O2N-CH2-COOH

• Which of the following ions has the electronic configuration 3d6 ?

(a) Ni 3+ (b) Co 3+ (c) Mn 2+ (d) Mn 3+ Answer:  (b) CO 3+

• Consider the following standard electrode potential values:

Fe3+ (aq) + e- —> Fe2+ (aq) Eo = + 0.77 V MnO4- (aq) + 8H+ + 5e- —-> Mn2+ (aq) + 4H2O (l) Eo = + 1.51V What is the cell potential for the redox reaction? (a) -2.28 V (b) – 0.74 V (c) + 0.74 V (d) + 2.28 V Answer:  (c)  +0.74 V

• The following experimental rate data were obtained for a reaction carried out at 25o C:

A(g) + B(g) —-> C(g) + D(g)

• A voltaic cell is made by connecting two half cells represented by half equations below:

Sn2+(aq) + 2e- –>Sn(s)Eo=-0.14 V

Fe3+(aq)+e- –> Fe2+ (aq)Eo=+0.77 V

• Which statement is correct about this voltaic cell?

(a) Fe2+ is oxidised and the voltage of the cell is -0.91 V. (b) Sn is oxidised and the voltage of the cell is 0.91 V. (c) Fe2+ is oxidised and the voltage of the cell is 0.91 V. (d) Sn is oxidised and the voltage of the cell is 0.63 V.

Answer:  to be updated

• What are the orders with respect to A(g) and B(g)?

Answer:  To be updated

• Which of the following aqueous solution will have highest boiling point?

(a) 1.0 M KCl

(b) 1.0 M K 2 SO4

(c) 2.0 M KCl

(d) 2.0 M K2SO4

• Amides can be converted into amines by the reaction named

(a) Hoffmann degradation

(b) Ammonolysis

(c) Carbylamine

(d) Diazotisation

Answer:  (a) Hoffmann degradation

• Which of the following would not be a good choice for reducing nitrobenzene to aniline?

(c) Fe and HCl

(d) Sn and HCl

Answer:  (a) LiA l H 4

• Which property of transition metals enables them to behave as catalysts?

(a) High melting point

(b) High ionisation enthalpy

(c) Alloy Formation

(d) Variable oxidation states

Answer:  (d) Variable oxidation states

• Which of the following statements is not true about glucose?

(a) It is an aldohexose.

(b) On heating with HI it forms n-hexane.

(c) It is present in pyranose form.

(d) It gives 2,4 DNP test.

Answer:  (d) It gives 2,4 DNP test.

• Which of the following alcohols will not undergo oxidation?

(a) Butanol

(b) Butan-2-ol

(c) 2-Methylbutan-2-ol

(d) 3-Methylbutan-2-ol

Answer: ( d) 3-Methylbutan-2-ol

• Four half reactions I to IV are shown below:
•  2Cl- —> Cl2 + 2e-
• 4OH- —-> O2 + 2H2O + 2e-
• Na+ + e- —-> Na
• 2H+ + 2e- —-> H2

 Which two of these reactions are most likely to occur when concentrated brine is electrolysed?

(a) I and III

(b) I and IV

(c) II and III

(d) II and IV

For the questions 15 to 18 , two statements are given – one labeled as Assertion (A) and the other labelled as Reason (R ). Select the correct answer to these questions from the codes (a), (b), (c ), and (d) as given below:

(a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.

• Assertion (A) :  Vitamin C cannot be stored in our body.

Reason (R) :  Vitamin C is fat soluble and is excreted from the body in urine. Answer: (c) Assertion (A) is true but Reason (R) is false

• Assertion (A) :  The half life of a reaction is the time in which the concentration of the reactant is reduced to one half of its initial concentration.

Reason (R) :  In first order kinetics when concentration of reactant is doubled, its half life is doubled.

• Assertion (A) :  Bromination of benzoic acid gives m-bromobenzoic acid.

Reason (R) :  Carboxyl group increases the electron density at the meta position. Answer: (a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A).

• Assertion (A):  EDTA is a hexadentate ligand.

Reason (R) :  EDTA has 2 nitrogen and 4 oxygen donor atoms. Answer: (a) Both Assertion (A) and Reason (R ) are true and (R) is the correct explanation of the Assertion (A).

CBSE Class 12 Chemistry Exam Paper Analysis – Last year

We surveyed students to find out what they thought of the CBSE Class 12 Chemistry Paper Review 2024. The overall paper was simple to moderate. The questions were straightforward, and nothing was outside of the syllabus. There were some math problems that tested students’ analytical abilities, but everything else was typical in terms of complexity.

Section A, which consisted of MCQs, was the top-scoring component of the exam, according to our subject experts. For your convenience, the answer key for the Class 12 Chemistry test is provided in the sections below.

Class 12 Chemistry Question Paper PDF of Last year

After Completion of the Exam, here we have provided the CBSE Class 12 Chemistry Question Papers Pdf of last year. Candidates may download Class 12 Chemistry Question Papers and analyze the Class 12 Chemistry Answer key to calculate their expected scores.

Class 12 Chemistry Answer Key- Previous Year’s Repeated Questions

Q.1: Arrange the following compounds in the increasing order of their property indicated .

i) Acetaldehyde, Benzaldehyde, Acetophenone, Acetone(Reactivity towards HCN)

Answer. Acetaldehyde<Acetone<Benzaldehyde<Acetophenone

iii) CH3CH2OH, CH3CHO, CH3COOH (Boiling point)

Answer.  CH3COOH<CH3CH2OH<CH3CHO

Q.2: In a plot of m against the square root of concentration (C12) for strong and weak electrolytes, the value of limiting molar conductivity of a weak electrolyte cannot be obtained graphically. Suggest a way to obtain this value. Also state the related law, if any.

Yes, we can do it by Kohlrausch’s law.

Kohlrausch’s law:  a statement in physical chemistry: the migration of an ion at infinite dilution is dependent on the nature of the solvent and on the potential gradient but not on the other ions present.

Q.3: Write reasons for the following statements : 

(i) Benzoic acid does not undergo Friedel-Crafts reaction.

No, benzoic acid does not undergo Friedel Craft reaction because the carboxylic group is deactivating and the Lewis acid catalyst and carboxylic group are bonded.

(ii) Oxidation of aldehydes is easier than that of ketones.

oxidation of aldenyde is easier than ketone due to presence of H-atoms linked to carbonyl group carbon which is absent in ketones.

Q.4: Write reasons for the following: 

(i) Ethylamine is soluble in water whereas aniline is insoluble. 

Ethylamine when added to water forms intermolecular H−bonds with water. Hence it is soluble in water. But aniline Can form H−bonding with water to a very small extent due to the presence of a large hydrophobic −C6H5 group. Hence aniline is insoluble in water.

(ii) Amino group is o- and p-directing in aromatic electrophilic substitution reactions, but aniline on nitration gives a substantial amount of m-nitroaniline. 

Nitration is carried out in an acidic medium. In an acidic medium, aniline is protonated to give anilinium ion (which is meta-directing).

For this reason, aniline on nitration gives a substantial amount of m-nitroaniline.

(iii) Amines behave as nucleophiles.

A nucleophile is a substance that is attracted to, and then attacks, a positive or slightly positive part of another molecule or ion. All amines contain an active lone pair of electrons on the very electronegative nitrogen atom. It is these electrons that are attracted to positive parts of other molecules or ions.

b) How will you carry out the following conversions :

i) Nitrobenzene to Aniline 

Nitrobenzene is reduced to aniline by Sn and concentrated HCl. Instead of Sn, Zn or Fe also can be used. Aniline salt is given from this reaction. Then aqueous NaOH is added to the aniline salt to get released aniline. This reaction is called nitrobenzene reduction.

• Benzene is a clear, colourless, highly flammable and volatile, liquid compound.
• Aniline is a yellowish to brownish oily liquid with a musty fishy odour organic compound.

ii) Ethanamide to Methanamine

React ethanamine with nitrous acid to form an azo compound, which further reacts with water to form ethanol, which on oxidising gives ethanoic acid. After treating with an excess of ammonia the ethanoic acid becomes ethanamide, which on further reacting with Bomine and a strong base (Hoffmann bromamide degradation reaction) to form methenamine.

iii) Ethanenitrile to Ethanamine 

it’s simple reduction of nitriles with lithium aluminium hydride or catalytic hydrogenation produce primary amines. the reaction is

CH3C≡N + H2/Ni OR LiAlH4 →  CH3CH2NH2

Q.5(a)(i) Write the electronic configuration of d5 on the basis of crystal field splitting theory if Δ0 < P.

When Δo < P, it is weak field and high spin situation’. As a result one electron entered in eg orbital and 3 electrons in t2g.

(ii) [Fe(CN)6]³- is weakly paramagnetic whereas [Fe(CN)6]4- is diamagnetic. Give reason to support this statement [Atomic no. Fe = 26].

Since CN −  is a strong field ligand, it causes the pairing of unpaired electrons. Therefore, there is only one unpaired electron left in the  d -orbital.

On the other hand, H 2 O is a weak field ligand. Therefore, it cannot cause the pairing of electrons. This means that the number of unpaired electrons is 5.

(iii) Write the number of ions produced from the complex [Co(NH3)6]C12 in solution. 

The given complex can be written as [Co(NH3)6]Cl2. Thus, [Co(NH3)6]+ along with two Cl− ions are produced.

Q.(b)(i) Calculate the spin only magnetic moment of the complex [CoF613-. (Atomic no. of Co = 2 7)

Given ion is  M 2+  with the atomic no. 27.

(iii) Which out of the two complexes is more stable and why ? 

[Fe(H20)6]3+, [Fe(C204)3]3–

[Fe(C204)3]3– is more stable out of two complexes. The central metal ion is Fe3+ and C2O4 2– is negative bi-dentate ligand which forms more stable complex than neutral or monodentate ligand.

Q.6 (i) Which ion amongst the following is colourless and why?

Ti4+, Cr3+, V3+

(Atomic number of Ti = 22, Cr = 24, V = 23)

Ti is colourless because it is having no unpaired e − e-  for excitation to higher energy level and it is colourless.

(ii) Why is Mn²+ much more resistant than Fe²+ towards oxidation?

Mn2+ is much more resistant than Fe2+ towards oxidationAs Mn2+ has stable configuration hence it is resistant towards oxidation. while in Fe2+ electronic configuration is 3d6 so it can lose one electron to give stable configuration 3d5.

(iii) Highest oxidation state of a metal is shown in its oxide or fluoride only. Justify the statement.

The highest oxidation state of a metal is exhibited in its oxide or fluoride only. This is because fluorine (F) and oxygen (O)are the most electronegative elements and the highest oxidation state shown by any transition element is +8.

Q.7 A compound ‘A’ (C2H4O) on oxidation gives ‘B’ (C2H4O2). ‘A’ undergoes an Iodoform reaction to give yellow precipitate and reacts with HCN to form the compound ‘C’. ‘C’ on hydrolysis gives 2-hydroxypropanoic acid. Identify the compounds ‘A’, ‘B’ and ‘C’. Write down equations for the reactions involved. 

Q.9(a) Write equations involved in the following reactions :

(i) Ethanamine reacts with acetyl chloride.

(ii) Aniline reacts with bromine water at room temperature. 

(iii) Aniline reacts with chloroform and ethanolic potassium hydroxide.

When aniline reacts with chloroform and alcoholic  K O H  it gives an offensive smelling liquid i.e., phenyl isocyanide as product. It is called as isocyanide test. It is given by aliphatic and aromatic primary amines.

Q.9 (b)  (i) Write the IUPAC name for the following organic compound:  (CH3CH2)2NCH3

( C H 3 ​ C H 2 ​ ) 2 ​ N C H 3 ​ it is a tertiary amine, and the parent chain is ethanamine. IUPAC name is N – Ethyl – N- methyl ethanamine.

(ii) Write the equations for the following: 

(I) Gabriel phthalimide synthesis

Gabriel Phthalimide Synthesis Mechanism has 3 steps. The Synthesis is used to get primary amines from primary alkyl halides and is named after the German scientist Siegmund Gabriel.

The reaction has been generalized for applications in the alkylation of sulfonamides and imides & their deprotection in order to obtain amines. Alkylation of ammonia is quite inefficient, therefore it is substituted with phthalimide anion in the Gabriel synthesis.

(II) Hoffmann bromamide degradation 

When an amide is treated with bromine in an aqueous or ethanolic solution of sodium hydroxide, degradation of amide takes place leading to the formation of primary amine. This reaction involving degradation of amide and is popularly known as Hoffmann bromamide degradation reaction. The primary amine thus formed contains one carbon less than the number of carbon atoms in that amide.

RCONH 2  +Br 2  + 4NaOH

R-NH 2  + Na 2 CO 3  + 2NaBr + 2H 2 O

Q.11(a) i) Silver atom has completely filled d-orbitals in its ground state, it is still considered to be a transition element. Justify the statement. 

Silver (Ag) belongs to group 11 of d-block and its ground state electronic configuration is 4d10 5s1. It shows an oxidation state of +2 in its compounds like AgO and AgF2 in which its electronic configuration is d9 so it is a transition element.

ii) Why are E° values of Mn and Zn more negative than expected? 

Negative E° values of Mn2+ and Zn2+ are because of the stabilities of half-filled (3d5 : Mn2+)and fullyfilled (3d10 : Zn2+) configuration respectively. Ni2+ ion has higher E°  value due to highest negative enthalpy of hydration.

iii) Why do transition metals form alloys?

Transition metals have very similar atomic sizes. One metal can easily replace the other metal from its lattice to form solid solution (alloy). Transition metals are miscible with one another in the molten state. The molten state solution of two or more transition metals on cooling forms alloy.

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When will CBSE class 12 Chemistry Exam takes place?

The CBSE Chemistry Examination is going to take place on 27 February 2024.

How many Sections are there in the class 12 Chemistry Question paper?

Class 12 Chemistry Question paper has 5 sections with 35 questions for 70 marks.

What is the totals marks of class 12 Chemistry Question paper?

The totals marks of the class 12 Chemistry Question paper is 70 marks

Hi, I am Brajesh (M.Tech, MCA), I Professional Educator having 3 years of experience in school education sector. Aim to provide JEE, NEET, CUET, and Other Entrance exams information in a simple way to help students find clarity and confidence. I provide here easily accessible content on Exam Notifications, Syllabus, Admit Cards, and Results.

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Great article, the information provided to us. Thank you

Sir we need for physics

nice solutions for class 12 chemistry

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The Economic Times daily newspaper is available online now.

Cbse board class 12 results 2024: rules for mark verification and answer sheet revaluation explained.

CBSE board class 12 results 2024: Students desiring to challenge their assigned marks can participate in a re-evaluation procedure for their responses. However, only those who have obtained photocopies of their evaluated answer booklets are eligible.

CBSE Class 12 verification of marks and revaluation last date

• Verification of Marks: Available from the 4th to the 8th day after the result declaration, lasting for 5 days.
• Obtaining Photocopy of Evaluated Answer Book(s): Accessible from the 19th to the 20th day after the result declaration, open for 2 days.
• Re-evaluation of Answer(s): Open from the 24th to the 25th day after the result declaration, accessible for 2 days.

CBSE Class 12 verification of marks and revaluation - key points

• In the online process, only one application per step is permissible for each candidate.
• Decisions regarding whether to apply for a single subject or multiple subjects must be made in advance.
• Verification of marks - Processing charges Rs 500 per subject
• Only those who have applied for verification of markets will be allowed to apply for photocopy of answer sheet.
• Processing charges for obtaining photocopy of answer sheet - Rs 700 per subject
• If the candidate wants to challenge the marks awarded to any answer, then the candidate has to apply for re-evaluation of answers online.
• Only those candidates who have applied for obtaining a photocopy of the evaluated answer book shall be eligible to apply for re- evaluation or challenge the marks awarded
• Request for re-evaluation/challenges shall be accepted only for the theory portion Rs 100 per question

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Hitler-themed class assignment raises red flags at metro Atlanta school

Hitler-themed assignment sparks controversy.

A Hitler-themed class assignment has caused some controversy at a metro Atlanta school. FOX 5 exclusively obtained the questions posed to 8th graders at the Mount Vernon School which asked them to rate some of Hitler's attributes.

ATLANTA - A Hitler-themed class assignment is causing controversy at a metro Atlanta school.

FOX 5 exclusively obtained the questions posed to 8th graders at the Mount Vernon School which asked them to rate some of Hitler’s attributes.

Some parents have expressed concern and outrage at that assignment and question if it is antisemitic in nature.

School officials told me this afternoon that when they learned how the assignment was written it was removed from the curriculum.

One question asked: "How would you rate Adolf Hitler as a ‘solution seeker’?"

Another question asked: "How would you rate Adolf Hitler as an ethical decision-maker?"

The Mount Vernon School

"It’s troubling," commented one student. Some students questioned the appropriateness of the assignment and if the question glorified the Nazi leader.

"Obviously, that looks horrible in the current context," said one student. "Knowing Mount Vernon, we do things a little odd around here. We try to think outside the box, but oftentimes that doesn’t work."

Several students told FOX 5 that the questions were not in their curriculum when they were in 8th grade. The Mount Vernon School says it wholeheartedly denounces antisemitism and gave Fox 5 a letter in response.

Letter from Kristy Lundstrom, head of The Mount Vernon School

"The intent of the assignment was an exploration of World War II designed to boost student knowledge of factual events and understand the manipulation of fear leveraged by Adolf Hitler in connection to the Treaty of Versailles," wrote a school official.

One student says he can see the school’s intended approach to critical thinking.

"I can definitely see why they’d be upset, but overall, I think it’s important to look at both sides of the coin in every situation and I think it’s important to be able to compare and contrast everything that’s happened in our world history, whether it’s been good or bad," said the student.