Each chapters and topics in CBSE Class 12th Chemistry exam has different weightage. Knowing about the weightage helps students prioritise topics accordingly. Check here CBSE Class 12th Chemistry Weightage 2026!
The CBSE Class 12 Chemistry 2026 exam will have a total score of 100, of which 70 is allocated for the theory paper and 30 marks for the practical assessment. The theory paper will be divided into five parts, A to E. Part A carries 16 marks. Part B carries 10 marks. Part C will be awarded 21 marks. Part D consists of 8 marks. Part E consists of 15 marks.
The practical assessment for CBSE Class 12 Chemistry is divided into 5 sections: salt analysis and volumetric analysis (8 marks each), content-based experiments (6 marks), project work, viva, and class record (4 marks each). Theory exams will last for three hours, while practicals will last for two. The exam doesn't carry any negative marking, and students need to score a minimum of 33% to pass.
To gain more marks in the exam, you need to know the CBSE Class 12th Chemistry 2026 Exam Pattern and High Weightage chapters. Some high-weightage chapters include Electrochemistry (9 marks) and Ketones, Aldehydes, and Carboxylic Acids (8 marks), etc.
You can refer to the table below for complete information on the CBSE Class 12th Chemistry Exam Weightage 2026.
CBSE Class 12th Chemistry Exam Pattern 2026
Chemistry paper is a 70-mark paper and divided into five sections (A-E). In this paper, you must attempt 33 questions totaling 70 marks. The following table shows the CBSE 12th Chemistry exam pattern:
|
Section |
Question Format |
Total Questions |
Marks per Question |
Section Marks |
|
A |
Objective Type (MCQs) |
16 |
1 |
16 |
|
B |
Short Response Questions |
5 |
2 |
10 |
|
C |
Short Descriptive Questions |
7 |
3 |
21 |
|
D |
Case Study–Based Questions |
2 |
4 |
8 |
|
E |
Long Descriptive Questions |
3 |
5 |
15 |
|
Overall Total |
— |
33 Questions |
— |
70 Marks |
Also Read: CBSE Class 12th Chemistry Exam Pattern 2026
CBSE Class 12th Chemistry Unit-Wise Weightage 2026
Each of the CBSE 12th Chemistry syllabus units carries a different weightage. So, it is important that you know the CBSE 12th Chemistry unit-by-unit marking system in order to develop your study plan accordingly. Some high-weightage topics are Aldehydes, Ketones, and Carboxylic Acids (11%) and Electrochemistry (12%).
|
Component |
Weightage % |
|
Solutions |
10% |
|
Electrochemistry |
12% |
|
Chemical Kinetics |
10% |
|
The d and f-Block Elements |
10% |
|
Coordination Compounds |
10% |
|
Haloalkanes and Haloarenes |
9% |
|
Alcohols, Phenols and Ethers |
9% |
|
Aldehydes, Ketones and Carboxylic Acids |
11% |
|
Amines |
9% |
|
Biomolecules |
10% |
Also read: CBSE Class 12 Chemistry Syllabus 2026
CBSE Class 12th Chemistry Chapter-Wise Weightage 2026
CBSE Class 12 Chemistry Chapter-Wise Weightage 2026 is helpful in knowing the marks allotted across various chapters in the board exam. If you know the weightage, you can focus more on chapters with a higher score potential, such as electrochemistry, chemical kinetics, aldehydes, ketones, carboxylic acids, and biomolecules.
|
Component |
Marks |
|
Solutions |
7 |
|
Electrochemistry |
9 |
|
Chemical Kinetics |
7 |
|
The d- and f-Block Elements |
7 |
|
Coordination Compounds |
7 |
|
Haloalkanes and Haloarenes |
6 |
|
Alcohols, Phenols and Ethers |
6 |
|
Aldehydes, Ketones and Carboxylic Acids |
8 |
|
Amines |
6 |
|
Biomolecules |
7 |
CBSE Class 12th Chemistry Internal Assessment Weightage 2026
Internal Assessment for CBSE Chemistry Class 12 holds 30 % of the Weightage in the exam.Examples from the practical curriculum include creating one lyophilic and one lyophobic sol, determining how temperature and concentration affect the pace at which sodium thiosulphate and hydrochloric acid react, and preparing potassium ferric oxalate. Chemistry projects for CBSE Class 12 can involve activities like calculating the amount of casein in various milk samples, evaluating guava fruit at various ripening stages for the presence of oxalate ions, and extracting essential oils from saunf (aniseed), ajwain (carom), illaichi, and other. Here is the weightage for each chemistry internal assessment:
|
Component |
Marks |
|
Volumetric Analysis |
8 |
|
Salt Analysis |
8 |
|
Content-Based Experiment |
6 |
|
Project Work |
4 |
|
Class Record and Viva |
4 |
|
Total |
30 |
How to Score High Using CBSE Class 12th Chemistry Weightage 2026
The following are some key points for scoring high in CBSE Class 12 Chemistry 2026 using weightage:
- First, get a good grasp of the CBSE Class 12 Chemistry Exam Pattern 2026 and CBSE Class 12 Chemistry Syllabus 2026 so that you know where to focus.
- Put your focus on High-Weightage Units- Units that carry more marks. These chapters deserve more of your time.
- Get a grip on all the topics covered in each unit. For example, Solutions consist of solubility, colligative properties, and types of solutions. Do not completely disregard the minor topics, as the CBSE generally tests them in the form of multiple-choice questions (MCQs).
- Make sure you have answered at least 5–10 previous year question papers and sample papers so you can get an idea about the format, question type, level of difficulty, and questions that repeat.
- Prepare quick notes and mind maps to aid in your last-minute revision.
-
Total exam score: 100 marks. -
Theory paper: 70 marks, 33 questions. -
Practical assessment: 30 marks. -
Minimum 33% score to pass.
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