Chemistry Class 12 Marks Distribution with Weightage 2026
Get complete breakdown of exam format, marking schemes, and topic-wise weightage for Class 12 Chemistry across CBSE, ISC, Bihar, and Maharashtra HSC boards to help students prepare effectively.
Chemistry is an important subjects for Class 12 students in science stream. To help students prepare effectively for Class 12th board exams, we have provided Weightage of Chemistry Class 12 Chapter Wise 2026 CBSE and ISC in detail on this page. Chemistry Class 12 Marks Distribution with Weightage will help students in prioritising important topics. For CBSE Class 12 Board Exams, students must obtain 33 percent marks in each subject to pass. Those who get overall pass percentage but fails in subject will need to appear for Class 12 supplementary exam. CBSE has also released sample papers for Class 12 Board Exams 2026. Referring to these papers, along with the Chemistry Chapter Wise Weightage for Board will give students a clear strategy for exam preparation.
Also Read:
- CBSE Class 12 Chemistry Weightage
- ISC Class 12 Chemistry Weightage 2026
- Bihar Board 12th Chemistry Weightage 2026
- Maharashtra HSC Chapter-wise weightage for Chemistry 2026
CBSE Class 12 Chemistry Weightage
Students can check unit wise distribution of marks for CBSE Class 12 Chemistry exam.
| Unit |
Marks |
|---|---|
| Solutions |
7 |
| Electrochemistry |
9 |
| Chemical Kinetics |
7 |
| d -and f -Block Elements |
7 |
| 7 |
|
| Haloalkanes and Haloarenes |
6 |
| 6 |
|
| Aldehydes, Ketones and Carboxylic Acids |
8 |
| Amines |
6 |
| 7 |
|
| Total |
70 |
ISC Class 12 Chemistry Weightage 2026
The weightage of each chapter helps students score well in the Chemistry Class 12 ISC Board exam. Check the unit wise distribution of marks for ISC Class 12 Chemistry exam.
| Unit |
Marks Distribution |
|---|---|
| Solutions |
Physical Chemistry |
| Electrochemistry |
|
| Chemical Kinetics |
|
| d-and-f-Block Elements |
Inorganic Chemistry |
| Coordination Compounds |
|
| Haloalkanes and Haloarenes |
Organic Chemistry |
| Alcohols, Phenols and Ethers |
|
| Aldehydes, Ketones and Carboxylic acids |
|
| Organic Compounds Containing Nitrogen |
|
| Biomolecules |
|
| Total Marks |
70 |
Bihar Board 12th Chemistry Weightage 2026
Below is unit wise distribution of marks for Bihar Board (BSEB) chemistry exam.
CBSE is expected to conduct the CBSE Class 12 Physics exams 2026 on February 21, 2026. The Board will likely release the CBSE date sheet 2026 in November 2025. You can click on CBSE 12th date sheet 2026 to check the Class 12 exam dates for all subjects.
Maharashtra HSC exams are held in two shifts. The Morning Shift is from 11 am to 2.10 pm while the Evening Shift is from 3 pm to 6 .10 pm.
Students can click on Maharashtra HSC time table to check the detailed exam schedule.
| Unit |
Weightage |
|---|---|
| Solid State |
04 |
| Solutions |
05 |
| Electrochemistry |
05 |
| Chemical Kinetics |
05 |
| Surface Chemistry |
04 |
| General Principles and Processes of Isolation of Elements |
03 |
| p-block Elements |
08 |
| d and f-block elements |
05 |
| Coordination Compounds |
03 |
| Haloalkanes and Haloarenes |
04 |
| Alcohols, Phenols, and Ethers |
04 |
| Aldehydes, Ketones, and Carboxylic Acids |
06 |
| Organic Compounds and containing Nitrogen |
04 |
| Biomolecules |
04 |
| Polymers |
03 |
| Chemistry in Everyday Life |
03 |
| Total |
70 |
Maharashtra HSC Chapter-wise weightage for Chemistry 2026
Check the unit-wise distribution of marks for the Maharashtra HSC chemistry exam.
| Unit |
Marks without option |
Marks with option |
|---|---|---|
| Solid State |
04 |
06 |
| Solutions and Colligative Properties |
05 |
07 |
| Chemical Thermodynamics and Energetic |
06 |
08 |
| Electrochemistry |
05 |
07 |
| Chemical Kinetics |
04 |
06 |
| General Principles and Processes of Isolation of Elements |
03 |
05 |
| p-Block Elements |
08 |
10 |
| d and f – Block Elements |
05 |
06 |
| Coordination Compounds |
03 |
04 |
| Halogen Derivatives of Alkanes and Arenes |
04 |
06 |
| Alcohols, Phenols, and Ethers |
04 |
06 |
| Aldehydes, Ketones and Carboxylic Acids |
05 |
07 |
| Compounds Containing Nitrogen
|
04 |
06 |
| Biomolecules |
04 |
06 |
| Polymers |
03 |
04 |
| Chemistry in Everyday Life |
03 |
04 |
Read more:
The ISC time table 2026 was released on November 13, 2025. The Council for the Indian School Certificate Examinations (CISCE) announced the ISC 12th time table on their official website, cisce.org. The ISC date sheet 2026 includes all subjects' exam dates and timings. The examinations will be held between February 12 and April 6, 2026.
The exams are held in pen and paper format. Students are advised to go through the ISC syllabus and exam pattern 2026 thoroughly before the release of time table.
ISC practical exams 2026 will likely be conducted in January 2026. The ISC time table 2026 is expected to release in the last week of November 2025. The ISC Board theory exams 2026 will be held offline or in pen and paper format between February 13 and April 5, 2026, tentatively.
The board officials conduct HSC exam in two shifts : morning shift from 11am to 2.10 pm and evening shift from 3pm to 6.10pm. The timings for all streams : Science, Commerce, Arts and general remains the same. All the students appearing for their board examination should reach their respective centers well before time to avoid unnecessary chaos.
Comments
(2)
No, CBSE released the CBSE Class 12 date sheet for all subjects together. However, to make the exam dates simpler to find and use, Shiksha.com divides and shares the CBSE 12th date sheet according to three streams - Science, Commerce and Arts.
Students can click on CBSE 12th Date Sheet to check stream-wise date sheet for CBSE 12th board exams.