Important Questions for CBSE Class 12 Chemistry

About Important Questions for CBSE Class 12 Chemistry

Chapter-Wise Preparation Guide by MyClass24

Are you searching for important questions for CBSE Class 12 Chemistry to score high marks in your board exam? You have landed on the right page. Class 12 Chemistry feels tough to many students because it has three big parts – Physical Chemistry, Organic Chemistry, and Inorganic Chemistry. Every part has its own formulas, reactions, and concepts, and the CBSE board paper picks questions from all three parts every year. Master your CBSE Class 12 Chemistry revision in 11 days—enrol in our course today!

This page gives you a simple, easy-to-follow list of CBSE Class 12 Chemistry important questions, along with the key concepts and formulas you need before your final exam. Whether you are revising for your board exam, brushing up before NEET or JEE, or simply trying to finish your Class 12 Chemistry syllabus faster, this guide tells you what to study and how to study it well. We have covered important questions in class 12 chemistry from chapters such as Solutions, Electrochemistry, Chemical Kinetics, d and f Block Elements, Coordination Compounds, Haloalkanes, Alcohols, Aldehydes and Ketones, Amines, and Biomolecules. Keep this page open while revising, and use it alongside your NCERT textbook for the best results.

Find and Download All Chapter-wise Important Questions for CBSE Class 12 Chemistry

Why Practicing Important Questions Matters

Reading a chapter once is not enough for Class 12 Chemistry. The CBSE exam pattern repeats certain question types every year – definition-based questions, reason-based questions, numerical problems, and reaction-based questions. When you practice CBSE Class 12 Chemistry important questions chapter by chapter, you start noticing these patterns yourself. You also get faster at writing chemical equations, drawing structures, and applying formulas under time pressure, which is exactly what the board exam demands.

Another reason this matters is the weightage system. CBSE gives fixed marks to Physical, Organic, and Inorganic Chemistry every year. If you only focus on your favourite topics and skip weaker chapters like Coordination Compounds or Biomolecules, you lose easy marks. A chapter-wise question bank helps you cover every unit equally instead of leaving gaps in your preparation. Before Solving the Important Questions one must solve NCERT solutions with the help of NCERT solutions for Class 12. 

Physical Chemistry – Important Questions and Formulas

Physical Chemistry carries a large share of numerical questions, so formulas matter a lot here. Some frequently asked topics include:

• Calculate the molality, molarity, and mole fraction of a solution.

• State and explain Raoult's Law for volatile and non-volatile solutes.

• Differentiate between ideal and non-ideal solutions with examples.

• Explain colligative properties – relative lowering of vapour pressure, elevation in boiling point, depression in freezing point, and osmotic pressure.

• Derive the relationship between Van't Hoff factor and colligative properties for solutes that dissociate or associate.

• Write the Nernst equation and use it to calculate the EMF of a cell.

• State Kohlrausch's Law and explain its use in calculating molar conductivity at infinite dilution.

• Explain order and molecularity of a reaction with suitable examples.

• Derive the integrated rate equation for a first-order reaction.

• Explain the effect of temperature on rate of reaction using the Arrhenius equation.

• What is catalysis? Explain the role of catalysts in industrial processes.

Important Formulas – Physical Chemistry

Inorganic Chemistry – Important Questions

Inorganic Chemistry in Class 12 focuses mainly on d and f block elements and coordination compounds. These chapters are rich in theory-based and reason-based questions.

• Explain why transition elements show variable oxidation states.

• Why do transition metals form coloured compounds?

• What is lanthanoid contraction, and why does it occur?

• Give reasons why Zn, Cd, and Hg are not considered typical transition elements.

• Write the IUPAC name of a given coordination compound.

• Explain Werner's theory of coordination compounds with an example.

• Differentiate between ionisation isomerism and coordination isomerism.

• Using Valence Bond Theory, explain the geometry and magnetic behaviour of [Ni(CN)₄]²⁻.

• Explain Crystal Field Theory and the splitting of d-orbitals in an octahedral field.

• What is meant by a chelate? Give one example of a chelating ligand.

Important Concepts – Coordination Chemistry

Organic Chemistry – Important Questions

Organic Chemistry in Class 12 is largely about converting one compound into another, naming reactions, and explaining mechanisms. These are the most repeated class 12 chemistry important questions from this section:

• Explain the mechanism of SN1 and SN2 reactions in haloalkanes with examples.

• Why is chlorobenzene less reactive towards nucleophilic substitution than chloroethane?

• How will you convert phenol into benzene, and ethanol into ethene?

• Distinguish between aldehydes and ketones using a suitable chemical test.

• Explain the Aldol condensation reaction with a suitable example.

• Arrange the following in increasing order of acidic strength: phenol, ethanol, and chlorophenol, giving reasons.

• Why are amines basic in nature? Compare the basicity of methylamine, aniline, and ammonia.

• Write the reaction and product for the Hoffmann bromamide degradation

• Classify carbohydrates based on their behaviour on hydrolysis, with examples.

• What are essential and non-essential amino acids? Give one example of each.

• Explain the structure and biological importance of DNA and RNA.

• What are polymers? Classify them as addition and condensation polymers with examples.

Important Name Reactions and Conversions

Biomolecules, Polymers, and Chemistry in Everyday Life

The last few chapters of the syllabus are shorter but still bring 3–5 mark questions every year. Focus on these areas:

• Difference between fibrous and globular proteins.

• What is denaturation of proteins, and what causes it?

• Explain the secondary structure of proteins – alpha helix and beta pleated sheet.

• What are enzymes, and how do they act as biological catalysts?

• Classify polymers as natural, semi-synthetic, and synthetic with examples of each.

• Difference between thermoplastic and thermosetting polymers.

• What are antibiotics, and how are they classified as broad-spectrum or narrow-spectrum?

• Explain the terms antiseptic and disinfectant with suitable examples.

• What are artificial sweeteners? Name two examples commonly used.

How to Use This Question List Effectively

Simply reading through this list will not be enough — you need a plan. Start by attempting each question without looking at your notes, then check your NCERT textbook for the exact wording CBSE expects, especially for definitions and reasons. For numerical questions from Physical Chemistry, practice at least five problems per formula so the steps become automatic. For Organic Chemistry conversions, draw out every intermediate step on paper instead of trying to do it mentally, since examiners give marks for correct intermediates too.

Revise the formula tables above a day before your exam, since most numerical mistakes happen due to forgetting a formula, not due to not knowing the concept. Pair this list with previous years' CBSE Class 12 Chemistry board papers and sample papers to understand the exact difficulty level and marking scheme used by CBSE. With steady daily practice of these important questions, along with your regular NCERT study, you can approach your Class 12 Chemistry board exam with confidence and aim for a high score.