30 Most Expected Questions for CBSE Class 12 Chemistry Exam 2026

CBSE Class 12 Chemistry Exam 2026 was scheduled for February 28, 2026.

A few days before the board exam, students should focus on formula-based questions from Solutions, Electrochemistry, and Chemical Kinetics, along with important name reactions and reasoning-based concepts from Organic Chemistry.

Here we share the 30 most expected questions for CBSE Class 12 Chemistry Exam 2026 based on previous year trends, frequently asked concepts, and high-weightage chapters to help you revise smartly and focus on what truly matters.

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Revise the 30 Most Expected Questions for CBSE Class 12 Chemistry Exam

Instead of reading the entire syllabus again, it is smarter to focus on repeated board patterns, important derivations, and numerical-heavy chapters. 

This video discussion highlights the most probable board exam questions, key formula-based numericals, assertion-reason concepts, and organic name reactions that have high chances of appearing. 

It also includes step-by-step Class 12 chemistry PYQs solutions, providing a structured revision approach that ensures better time management, clarity of concepts, and improved accuracy in the final examination.

CBSE Class 12 Chemistry Exam Chapter-wise Analysis of Important Topics

Here is a chapter-wise analysis of important topics you must not miss:

1. Solutions

Most important and frequently asked topics include:

• Henry’s Law

• Formula: P_gas = K_H * χ_gas

• P_gas: Partial pressure of the gas.

• K_H: Henry's Law Constant, dependent only on temperature.

• χ_gas: Mole fraction of the gas (solubility).

There is an inverse relationship between K_H and solubility. A higher K_H value means lower solubility.

• • Applications: Carbonated drinks, scuba diving, high-altitude anoxia

  • Direct conceptual and numerical questions are expected

• Raoult’s Law

• Raoult's Law applies to solutions with volatile components. The partial vapor pressure of a component is its pure vapor pressure multiplied by its mole fraction in the solution.

• (For two volatile liquids, A and B:

P_A = P°_A * χ_A

P_B = P°_B * χ_B

P_Total = P_A + P_B = (P°_A * χ_A) + (P°_B * χ_B))

• Total vapour pressure calculations

• Numericals based on mole fraction

• Ideal vs Non-Ideal Solutions

• Positive & Negative deviations

• ΔH_mix and ΔV_mix

• Intermolecular interactions

• Assertion-reason type questions

• Colligative Properties (Very Important for Numericals)

• Relative Lowering of Vapour Pressure (RLVP): (P°_solvent - P_solution) / P°_solvent = χ_solute

• Elevation in Boiling Point (ΔT_b): ΔT_b = i * K_b * m

• Depression in Freezing Point (ΔT_f): ΔT_f = i * K_f * m

• Osmotic Pressure (Π): Π = i * C * R * T

• Van’t Hoff Factor (i)

• Strong focus on formula-based numericals

2. Electrochemistry

High-weightage areas include:

• Standard Cell Potential (E°cell): E°_cell = E°_cathode - E°_anode. The higher reduction potential defines the cathode.

• Cell Representation: Anode | Anode Ion || Cathode Ion | Cathode. Stoichiometric coefficients are omitted.

• Galvanic vs Electrolytic Cell Differences

• The Nernst Equation (Very Important)

• Non-standard condition numericals

• Kohlrausch’s Law
  The limiting molar conductivity (Λ°_m) of an electrolyte is the sum of the individual contributions of its ions.

• Λ°_m (AB) = λ°_A⁺ + λ°_B⁻

• Conductivity & Molar Conductivity trends

• Faraday’s Laws of Electrolysis

3. Chemical Kinetics

Key focus areas includes:

• Order and Molecularity

• Integrated Rate Law (Zero & First order, especially)

• Units of rate constant

• Half-life relationships

• Arrhenius Equation

• Graph-based questions

• Determination of order from rate data

4. d- and f-Block Elements

d- and f-Block elements frequently asked concepts includes:

• Trends in 3d series

• Oxidation states & stability

• Colour and magnetic properties

• Copper’s positive reduction potential

• Cr²⁺ as reducing agent

• Zn²⁺ colourless nature

• Lanthanoid Contraction

• Preparation of:

• KMnO₄ (from pyrolusite)

• K₂Cr₂O₇ (from chromite)

• Oxidizing nature of manganates & dichromates

• Redox balancing in acidic medium

5. Coordination Chemistry

Most important topics include:

1. IUPAC Nomenclature

2. Oxidation number calculation

3. Geometrical & Optical Isomerism

4. Cis–Trans isomerism

5. VBT basics

6. Bonding & hybridization

6. Haloalkanes and Haloarenes

Important areas to revise are:

• Vinylic vs Allylic halides

• Boiling point trends

• Reactions of Benzene Diazonium Chloride

• Conversion-based questions (e.g., 1-iodobutane synthesis)

• Finkelstein reaction

7. Alcohols, Phenols and Ethers

High-scoring topics include:

• Preparation of phenol

• Kolbe’s reaction

• Grignard reagent reactions

• Mechanism of hydration of alkenes

• Boiling point order comparison

• Structure elucidation questions

8. Aldehydes, Ketones, and Carboxylic Acids

Important topics include:

• Iodoform Test

• Distinguishing similar compounds

• Multi-step organic conversions

• Etard reaction

• Hydrazone formation

9. Amines

Frequently asked questions include:

• Basicity comparison (Aniline vs Ammonia)

• Resonance effect

• Hinsberg’s Test

• Classification of amines

• Reaction mechanisms

10. Biomolecules

Important concepts to focus on for CBSE Class 12 Board exams:

• Structure of D-Glucose (evidence-based)

• Oxidation reactions of glucose

• Polysaccharides (Amylose, Glycogen, Cellulose)

• Glycosidic linkage

• Storage forms of carbohydrates