CBSE Class 12 Chemistry 2025 Exam Most Repeated Questions

CBSE Class 12 Chemistry Board Exam: Preparing for the CBSE Class 12 Chemistry Board Exam can be challenging, but focusing on the most frequently asked questions can make your study sessions more effective. By practicing these commonly repeated questions, you can strengthen your understanding of key concepts and improve your confidence for the exam. 

Resources like "CBSE Class 12 Chemistry Most Repeated Questions with Solutions" and "Chemistry Class 12 Important Questions with Answers PDF Download" can be particularly helpful. Additionally, reviewing "Class 12 Chemistry Chapter Wise Important Questions with Answers PDF" ensures comprehensive coverage of the syllabus.

As you plan your study schedule, it's important to note that the CBSE Class 12 Chemistry Board Exam is scheduled for Thursday, February 27, 2025. By concentrating on these key resources and being aware of your exam dates, you can approach your CBSE Class 12 Chemistry exam with greater confidence and readiness.

Class 12 Chemistry Important Questions for CBSE Board Exam 2025

Preparing for the CBSE Class 12 Chemistry Board Exam 2025? A smart way to boost your scores is by focusing on most repeated questions that frequently appear in exams. Understanding these questions helps in covering key concepts effectively and improving problem-solving skills.

In this guide, we have compiled the Most Repeated Questions in CBSE Class 12 Chemistry 2025, including short-answer and long-answer questions from different chapters. Along with these, we provide CBSE Class 12 Chemistry most repeated questions with solutions, helping you understand the best way to write answers and secure good marks.

To ensure thorough preparation, it is essential to refer to the CBSE Class 12 Chemistry Syllabus, which outlines important topics covered in the exam. Additionally, practicing with NCERT Solutions for Class 12 Chemistry will provide a strong foundation, as many CBSE board questions are directly picked from NCERT textbooks.

By focusing on these most repeated questions, practicing with NCERT solutions, and revising the CBSE syllabus, you can prepare efficiently for the CBSE Class 12 Chemistry Board Exam 2025 and maximize your score!

CBSE Class 12 Chemistry Most Repeated Questions

1-Mark Questions (Very Short Answer Type)

1. What is the order of reaction if the unit of rate constant is L mol⁻¹ s⁻¹?
2. Write the IUPAC name of CH₃CH₂COCH₃.
3. Define molar conductivity and write its unit.
4. Name the cell which is used in hearing aids.
5. What type of colloid is formed when a gas is dispersed in a liquid? Give an example.

2-Mark Questions (Short Answer Type)

6. Explain the role of Zn in the extraction of silver by the cyanide process.
7. Why does p-nitrophenol have a lower pKa value than phenol?
8. Write the difference between ideal and non-ideal solutions with an example.
9. Define electrophoresis and coagulation in colloids.
10. How is an ether prepared by the Williamson synthesis method?

3-Mark Questions (Short Answer Type)

11. Explain the mechanism of nucleophilic substitution (SN1 and SN2) reactions with an example.
12. Write the difference between order and molecularity of a reaction.
13. Derive the integrated rate equation for a first-order reaction.
14. Differentiate between Schottky defect and Frenkel defect in solids.
15. Write the Hinsberg test and its significance for distinguishing between primary, secondary, and tertiary amines.

5-Mark Questions (Long Answer Type)

16. Explain the electrochemical refining of copper with a labeled diagram.
17. What are coordination compounds? Write their applications in medicines and industry.
18. Describe the Haber’s process for the manufacture of ammonia with the reaction conditions.
19. Discuss the Bohr’s theory of atomic structure and its limitations.
20. Explain the mechanism of acid-catalyzed dehydration of ethanol to give ethene.

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CBSE Class 12 Chemistry Exam 2025 Pattern

The CBSE Class 12 Chemistry Exam 2025 is structured to assess students' understanding through a combination of theoretical and practical evaluations. Here's a detailed breakdown:

Theory Examination:

• Total Marks: 70
• Duration: 3 hours

Question Types and Weightage:

1. Competency-Based Questions: 50%
   • These include Multiple Choice Questions (MCQs), case-based questions, and source-based integrated questions, focusing on assessing students' application and analytical skills.
2. MCQs (Select Response Type Questions): 20%
   • Questions with multiple choices to test students' knowledge and understanding.
3. Constructed Response Questions: 30%
   • This section comprises short and long answer-type questions, evaluating students' ability to articulate and elaborate on concepts.

Unit-Wise Marks Distribution:

• Solutions: 7 marks
• Electrochemistry: 9 marks
• Chemical Kinetics: 7 marks
• d- and f-Block Elements: 7 marks
• Coordination Compounds: 7 marks
• Haloalkanes and Haloarenes: 6 marks
• Alcohols, Phenols, and Ethers: 6 marks
• Aldehydes, Ketones, and Carboxylic Acids: 8 marks
• Amines: 6 marks
• Biomolecules: 7 marks

Practical Examination:

• Total Marks: 30

Breakdown:

• Volumetric Analysis: 8 marks
• Salt Analysis: 8 marks
• Content-Based Experiment: 6 marks
• Project Work: 4 marks
• Class Record and Viva: 4 marks

How to Prepare Using CBSE Class 12 Chemistry Most Repeated Questions?

To excel in the CBSE Class 12 Chemistry Board Exam 2025, a strategic study approach is essential. One of the most effective ways to prepare is by focusing on CBSE Class 12 Chemistry Most Repeated Questions. Here’s how you can make the best use of them:

1. Identify Most Repeated Questions from Past Exams

• Analyze previous years’ question papers to find most repeated questions in CBSE Class 12 Chemistry 2025.
• Prioritize high-weightage topics such as Electrochemistry, Organic Chemistry, and Coordination Compounds.
• Focus on common 1-mark, 2-mark, 3-mark, and 5-mark questions that frequently appear in exams.

2. Practice with Solutions for Clarity

• Use CBSE Class 12 Chemistry most repeated questions with solutions to understand the correct answering pattern.
• Refer to NCERT Solutions for Class 12 Chemistry, as many board exam questions are directly picked from NCERT textbooks.
• Study the step-by-step explanation of numerical problems and derivations for strong conceptual clarity.

3. Revise the CBSE Class 12 Chemistry Syllabus Smartly

• Go through the CBSE Class 12 Chemistry Syllabus and mark high-scoring chapters.
• Allocate more time to topics with greater weightage in the exam.
• Make concise notes of formulas, reactions, and mechanisms for quick revision before the exam.

4. Attempt Mock Tests and Sample Papers

• Solve full-length mock tests and sample papers under real exam conditions to improve time management.
• Download CBSE Class 12 Chemistry most repeated questions PDF and attempt them regularly.
• Evaluate your performance and work on weak areas by revisiting those topics.

5. Focus on Organic Chemistry and Numericals

• Organic Chemistry: Memorize named reactions, functional group conversions, and mechanisms thoroughly.
• Numericals: Master electrochemistry, chemical kinetics, and mole concept problems by solving different variations of repeated questions.

6. Work on Answer Writing Skills

• Write to-the-point answers for short questions and detailed stepwise solutions for long questions.
• Use diagrams, equations, and flowcharts where applicable to score extra marks.
• Follow CBSE marking scheme and write precise, well-structured answers.

7. Stay Consistent & Revise Regularly

• Revise important topics and repeated questions at least 3 times before the exam.
• Use flashcards or charts to recall important formulas and reaction mechanisms.
• Stay consistent with daily practice and avoid last-minute cramming.