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CBSE

Class 12 Important Question

Chemistry

CBSE Important Questions for Class 12 Chemistry - 2025-26

Q: 4. What is the difference between important questions and questions from previous year papers (PYQPs)?

There is a key difference between the two resources. Previous Year Question Papers (PYQPs) are the exact questions that have appeared in past board exams. They show historical trends and the marking scheme. On the other hand, a list of Important Questions is a curated, predictive set prepared by subject matter experts. It includes high-frequency PYQPs but also new, potential questions based on the latest 2025-26 syllabus, changes in pattern, and topics that are likely to be asked. Important questions offer a more forward-looking preparation tool.

Q: 6. Are HOTS (Higher Order Thinking Skills) questions included in a set of important questions for Class 12 Chemistry?

Yes, a good collection of important questions must include HOTS (Higher Order Thinking Skills) questions. The CBSE board exam paper is designed to test not just memory but also analytical and application skills. Important questions prepare you for this by including complex numericals, application-based reasoning problems, and organic chemistry puzzles that may require linking concepts from multiple chapters. Practising these ensures you are prepared for the high-difficulty section of the exam.

Class 12 Chemistry Extra Questions and Answers Free PDF Download

Vedantu provides CBSE Class 12 Chemistry Important Questions according to the CBSE Class 12 Chemistry Syllabus to help students prepare for their exams by focusing on key topics from each chapter. These questions are selected to cover important concepts, making it easier for students to revise effectively. By practising these questions, students can improve their understanding and gain confidence. This resource is useful for quick revisions and ensures students are well-prepared to handle different exam questions.

Table of Content

Using these important questions allows students to build their confidence as they study. They can see what questions may appear on the exam and get comfortable answering them. This resource is a practical tool that helps students prepare effectively and do their best in Chemistry.

CBSE Class 12 Chemistry Chapter-wise Important Questions

CBSE Class 12 Chemistry Chapter-wise Important Questions and Answers cover topics from all 10 chapters, helping students prepare thoroughly by focusing on key topics for easier revision.

S. No	Chapter-wise Important Questions for Class 12 Chemistry
1	Chapter 1 - Solutions Questions
2	Chapter 2 - Electrochemistry Questions
3	Chapter 3 - Chemical Kinetics Questions
4	Chapter 4 - The d and f Block Elements Questions
5	Chapter 5 - Coordination Compounds Questions
6	Chapter 6 - Haloalkanes and Haloarenes Questions
7	Chapter 7 - Alcohols, Phenols and Ethers Questions
8	Chapter 8 - Aldehydes, Ketones and Carboxylic Acids Questions
9	Chapter 9 - Amines Questions
10	Chapter 10 - Biomolecules Questions

10 Most Important Questions From Class 12 Chemistry Chapters

1. What is the difference between physical and chemical changes?

Answer: Physical changes affect the form or appearance of a substance without altering its chemical composition, while chemical changes result in the formation of new substances with different properties.

2. Explain the concept of equilibrium in chemical reactions.

Answer: Chemical equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction, leading to constant concentrations of reactants and products over time.

3. What are colligative properties? Provide examples.

Answer: Colligative properties depend on the number of solute particles in a solution rather than their identity. Examples include vapour pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.

4. Describe the concept of hybridization and its types.

Answer: Hybridization is the mixing of atomic orbitals to form new hybrid orbitals for bonding. Types include sp, sp², sp³, dsp², and d²sp³, each corresponding to different molecular geometries.

5. What is the difference between ionic and covalent bonds?

Answer: Ionic bonds form through the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonds involve the sharing of electrons between atoms.

6. Explain the significance of the periodic table trends, such as atomic radius and electronegativity.

Answer: Atomic radius generally decreases across a period and increases down a group, while electronegativity increases across a period and decreases down a group. These trends help predict element behaviour in reactions.

7. What are isomers? Differentiate between structural and stereoisomers.

Answer: Isomers are compounds with the same molecular formula but different structures. Structural isomers differ in the connectivity of atoms, while stereoisomers have the same connectivity but differ in spatial arrangement.

8. Define pH and its significance in chemistry.

Answer: pH is a measure of the acidity or basicity of a solution, defined as the negative logarithm of the hydrogen ion concentration. It is crucial for understanding chemical reactions in solutions, including acid-base reactions.

9. What are the different types of chemical reactions? Provide examples.

Answer: Major types include:

Synthesis: A + B → AB
Decomposition: AB → A + B
Single Replacement: A + BC → AC + B
Double Replacement: AB + CD → AD + CB
Combustion: Hydrocarbon + O₂ → CO₂ + H₂O

10. What is the role of catalysts in chemical reactions?

Answer: Catalysts increase the rate of a chemical reaction by lowering the activation energy, allowing the reaction to proceed more quickly without being consumed in the process.

Here are some important questions for Class 12 Chemistry. For better understanding of each chapter, please go through the Chapter-wise Important Questions table. This resource will assist you in understanding the key concepts and important questions in each chapter and preparing effectively for your exams.

How does Class 12 Chemistry Important Questions Help you with Exams?

Important questions highlight key topics and concepts that are frequently tested, allowing students to focus their study efforts effectively on the most relevant material.
By practicing important questions, students can deepen their comprehension of complex concepts, which is essential for understanding the subject.
Familiarity with important questions helps students understand the format and style of exam questions, reducing anxiety and building confidence during tests.
These questions serve as a concise revision tool, helping students quickly recall critical information and reinforce their learning just before exams.
Working through important questions allows students to identify topics they find challenging, enabling them to allocate more time and resources to those areas.
Important questions often require students to apply their knowledge to solve problems, improving their analytical and problem-solving skills, which are vital for success in Chemistry.

Focusing on important questions in Class 12 Chemistry plays a vital role in exam preparation. These questions not only help students identify and understand key concepts but also enhance their problem-solving and critical-thinking skills. By practising these targeted questions, students can improve their confidence, manage their time effectively, and pinpoint areas that require further attention. Ultimately, this strategic approach to studying equips students with the tools they need to excel in their exams, making the learning process more efficient and effective.

Additional Study Materials for Class 12 Chemistry

S. No	Study Materials for Class 12 Chemistry
1	CBSE Class 12 Chemistry NCERT Solutions
2	CBSE Class 12 Chemistry Revision Notes
3	CBSE Class 12 Chemistry NCERT Book
4	CBSE Class 12 Chemistry Previous year Question Paper
5	CBSE Class 12 Chemistry Sample Papers

FAQs on CBSE Important Questions for Class 12 Chemistry - 2025-26

1. What types of questions are considered important for the CBSE Class 12 Chemistry board exam for 2025-26?

For the Class 12 Chemistry exam, important questions are typically a mix of formats designed to test different skills. You should focus on:

Numerical Problems: Especially from chapters like Solutions, Electrochemistry, and Chemical Kinetics.
Organic Chemistry Conversions: Multi-step problems involving synthesis or conversion of organic compounds.
Name Reactions and Mechanisms: Questions that ask you to write, explain, or apply a specific named reaction.
Reasoning-Based Questions: Often framed as 'Give Reason' or 'Explain Why', particularly for topics in d- and f-Block Elements and Coordination Compounds.
Distinction Tests: Chemical tests to differentiate between pairs of organic compounds.
Definitions and Laws: Stating and explaining fundamental laws like Raoult's Law or Kohlrausch's Law.

2. Which chapters have the highest weightage for important questions in the Class 12 Chemistry syllabus for 2025-26?

Based on the CBSE syllabus and past trends, certain chapters consistently have higher marks weightage. For the 2025-26 exams, you should pay special attention to preparing important questions from:

Electrochemistry
Chemical Kinetics
d- and f-Block Elements
Aldehydes, Ketones and Carboxylic Acids
Biomolecules

While these are high-weightage, it is crucial to cover the entire syllabus, as questions can be interlinked and cover multiple concepts.

3. How can practising important questions help me score above 95% in the Class 12 Chemistry board exam?

Scoring above 95% requires a strategic approach, and important questions are key to this. They help by:

Ensuring Comprehensive Coverage: They force you to practise the most frequently tested concepts and high-weightage topics, leaving no gaps in your preparation.
Improving Answer Presentation: By practising, you learn how to structure your answers, write mechanisms, and present numerical solutions exactly as expected by CBSE evaluators.
Mastering Time Management: Solving these questions under timed conditions helps you build speed and accuracy, which is crucial for completing the exam on time.
Building Confidence: Familiarity with the question patterns and types reduces exam anxiety and helps you tackle even the most challenging questions effectively.

4. What is the difference between important questions and questions from previous year papers (PYQPs)?

There is a key difference between the two resources. Previous Year Question Papers (PYQPs) are the exact questions that have appeared in past board exams. They show historical trends and the marking scheme. On the other hand, a list of Important Questions is a curated, predictive set prepared by subject matter experts. It includes high-frequency PYQPs but also new, potential questions based on the latest 2025-26 syllabus, changes in pattern, and topics that are likely to be asked. Important questions offer a more forward-looking preparation tool.

5. How should I use important questions for effective revision right before the board exam?

For effective revision, integrate important questions strategically. First, complete a chapter, then solve its important questions to test your understanding. In the final weeks before the exam, use a collection of important questions as a mock test. Set a timer and attempt to solve them to simulate exam conditions. Make a note of any questions or concepts you struggle with and revisit those specific topics one last time. This method reinforces learning and pinpoints your weakest areas for final polishing.

6. Are HOTS (Higher Order Thinking Skills) questions included in a set of important questions for Class 12 Chemistry?

Yes, a good collection of important questions must include HOTS (Higher Order Thinking Skills) questions. The CBSE board exam paper is designed to test not just memory but also analytical and application skills. Important questions prepare you for this by including complex numericals, application-based reasoning problems, and organic chemistry puzzles that may require linking concepts from multiple chapters. Practising these ensures you are prepared for the high-difficulty section of the exam.

7. How do important questions help in managing the difficulty level of the Class 12 Chemistry syllabus?

The Class 12 Chemistry syllabus can seem vast and challenging. Important questions help manage this difficulty by providing a structured path. They allow you to prioritise your efforts on topics that yield the most marks. By breaking down complex chapters into a series of testable questions, they make learning more targeted and less overwhelming. This focused practice builds a strong conceptual foundation and boosts confidence, making the overall subject feel more manageable.

8. Besides solving numericals, what other types of important questions should I focus on in Physical and Organic Chemistry?

While numericals are crucial, you must focus on other formats too. For Physical Chemistry, prioritise graph-based questions (e.g., from Chemical Kinetics), derivations of integrated rate equations, and conceptual questions on colligative properties. For Organic Chemistry, focus on name reactions, reaction mechanisms, a series of 'A gives B gives C' type conversion problems, and chemical tests to distinguish between compounds. These questions test deep conceptual understanding and are very common in board exams.