CBSE Class 12 Chemistry Previous Year Question Papers (2022–2026)

Class 12 Chemistry board papers with marking schemes

Two sets per year from different CBSE regions. Question papers are published by CBSE; click a PDF to download it free.

Class 12 Chemistry sample paper 2026-27

CBSE released the 2026-27 Sample Question Paper on 21 September 2026 and confirmed there is no change in the question paper design for 2026-27. Practise it first: it shows exactly how your board paper will look.

Chapter-wise weightage (from 8 board papers)

Average marks each chapter carried per board paper. Start revision with the chapters at the top.

Most repeated Chemistry questions in CBSE board exams

These questions (or near-identical ones) appeared in more than one board exam year.

1. (A) The concentration of the reactant is reduced from 0.6 mol L–1 to 0.2 mol L–1 in 5 minutes in a first order reaction. Calculate rate constant of the reaction. (log 3 = 0.48) 2 OR (B) Rate constant k for the first orde…
   Asked in 2022, 2023, 2024, 2025, 2026Chemical Kinetics2 marks
2. The slope in the plot of ln[R] vs. time for a first order reaction is 1 (a) + k 2.303 (b) – k (c) – k 2.303 (d) + k
   Asked in 2022, 2023, 2024, 2025, 2026Chemical Kinetics1 mark
3. When 19.5 g of F – CH2 – COOH (Molar mass = 78 g mol–1), is dissolved in 500 g of water, the depression in freezing point is observed to be 1C. Calculate the degree of dissociation of F – CH2 – COOH. [Given : Kf for wat…
   Asked in 2022, 2023, 2024, 2025, 2026General3 marks
4. A solution of glucose (molar mass = 180 g mol-l) in water has a boiling point of 100.20 °C. Calculate the freezing point of the same solution. Molal constants for water K and Kp are 1.86 K kg mol-1 and 0.512 K kg mol-1 r…
   Asked in 2023, 2024, 2025, 2026Solutions3 marks
5. /1/1-11 9 P.T.O. 12. Which functional groups of glucose interact to form cyclic hemiacetal leading to pyranose structure ? (A) Aldehyde group and hydroxyl group at C 4 (B) Aldehyde group and hydroxyl group at C 5 (C) Ket…
   Asked in 2023, 2024, 2025, 2026Aldehydes, Ketones & Carboxylic Acids1 mark
6. Scurvy is caused due to deficiency of (A) Vitamin B1 (B) Vitamin B2 (C)Ascorbic acid (D) Glutamic acid 56/2/1 P.T.O. (R) (A), (B), (C) (A) (A) (R) (R), (A) (B) (A) (R) , (R), (A) (C) (A) , (R) 1 (D) (A) , (R) 1 13. RUT (…
   Asked in 2023, 2024, 2025, 2026Biomolecules1 mark
7. Which of the following reactions is not explained by the open chain structure of glucose ? 1 (A) Glucose on prolonged heating with HI forms n-hexane. (B) Glucose reacts with hydroxylamine to form an oxime. (C) Glucose ge…
   Asked in 2023, 2024, 2025, 2026Biomolecules1 mark
8. (A)J Explain the following reactions and write chemical equation involved : 3×1=3 (a) Wolff-Kishner reduction (b) Etard reaction (c) Cannizzaro reaction OR (B) Write the structures of A, B and C in the following sequence…
   Asked in 2022, 2023, 2024, 2025Aldehydes, Ketones & Carboxylic Acids3 marks

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Class 12 Chemistry paper pattern

Based on the sample paper 2026-27 (50 marks).

CBSE additional practice papers for Class 12 Chemistry

Frequently asked questions