CBSE Class 12 Chemistry chapter-wise weightage 2027
How the board shares out the 70 theory marks of the 2027 Class 12 Chemistry exam, unit by unit, with the chapters in each unit. From CBSE's 2026-27 curriculum, checked on 2026-11-10. JEE Main and NEET are set from the same NCERT chapters, so for them every chapter counts; these weights are where the board puts its marks.
| Unit | Chapters | Marks | Share |
|---|---|---|---|
| Solutions | 1. Solutions | 7 | 10% |
| Electrochemistry | 2. Electrochemistry | 9 | 13% |
| Chemical Kinetics | 3. Chemical Kinetics | 7 | 10% |
| The d- and f-Block Elements | 4. The d- and f-Block Elements | 7 | 10% |
| Coordination Compounds | 5. Coordination Compounds | 7 | 10% |
| Haloalkanes and Haloarenes | 6. Haloalkanes and Haloarenes | 6 | 9% |
| Alcohols, Phenols and Ethers | 7. Alcohols, Phenols and Ethers | 6 | 9% |
| Aldehydes, Ketones and Carboxylic Acids | 8. Aldehydes, Ketones and Carboxylic Acids | 8 | 11% |
| Amines | 9. Amines | 6 | 9% |
| Biomolecules | 10. Biomolecules | 7 | 10% |
| Total | 70 | 100% |
Plus 30 marks for practical. Where a unit has more than one chapter, the board gives marks to the unit, not to each chapter.
Where the marks are
The paper: 33 questions, 70 marks, 3 hours
| Section | Questions | How many | Marks each | Total |
|---|---|---|---|---|
| Section A | 12 multiple-choice and 4 assertion-reason | 16 | 1 | 16 |
| Section B | Very short answer | 5 | 2 | 10 |
| Section C | Short answer | 7 | 3 | 21 |
| Section D | Case-based | 2 | 4 | 8 |
| Section E | Long answer | 3 | 5 | 15 |
From CBSE's 2026-27 sample question paper (PDF). Internal choice is given in some questions.
How to use this
- Start with Electrochemistry and Aldehydes, Ketones and Carboxylic Acids: together they are 17 of the 70 marks.
- Do not skip a small unit: Amines is 6 marks, often in short questions you can be sure of.
- Find your weakest chapter first: a free 25-minute test names it, then practise it on its page.
Practise the whole paper: free Class 12 Chemistry sample papers, set to these weights.
Questions students ask
Solutions: 7 marks; Electrochemistry: 9 marks; Chemical Kinetics: 7 marks; The 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. Total 70 marks in the theory paper, plus 30 for practical.
Electrochemistry, with 9 of 70 marks, then Aldehydes, Ketones and Carboxylic Acids with 8.
No. The unit marks in CBSE's 2026-27 curriculum are the same as in 2025-26.
33 questions for 70 marks in 3 hours: Section A, 16 × 1 mark (12 multiple-choice and 4 assertion-reason); Section B, 5 × 2 marks (very short answer); Section C, 7 × 3 marks (short answer); Section D, 2 × 4 marks (case-based); Section E, 3 × 5 marks (long answer).
Source: CBSE curriculum 2026-27, Chemistry. Unit marks from CBSE's 2026-27 curriculum; question pattern from CBSE's 2026-27 sample question papers. Read on cbseacademic.nic.in on 2026-11-10. Unit marks are unchanged from 2025-26.