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.
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.
Maharashtra board released the Mah HSC time table 2026 on October 31, 2025. The Maharashtra 12th board exams 2026 will be held between February 10 and March 11, 2026. The Maharashtra 12th exam dates 2026 can be checked here
| 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:
CBSE will conduct the CBSE practical exams between January 1 and Feb 14, 2026. There is no external examiner allotted to conduct practical exams for Class 10, while external examiners are called to conduct the CBSE 12th practical exams.
For winter-bound schools, CBSE practical exams 2026 were held between November 6 and December 6, 2026.
CBSE will conduct CBSE 12th exams 2026 between February 17 and April 9, 2026. The CBSE commerce exams 2026 will be held between February 21 and March 28, 2026. You can check the date sheet below:
Date | Subject |
|---|---|
21-Feb-2026 | Business studies, business administration |
9-Mar-2026 | Mathematics, applied mathematics |
12-Mar-2026 | English elective, English core |
18-Mar-2026 | Economics |
25-Mar-2026 | Informatics Practices, computer science, IT |
28-Mar-2026 | Accountancy |
Students can click on CBSE 12th date sheet 2026 to check and download the detailed CBSE Class 12 date sheet.
You will be allowed to wear a simple analogue watch, which shows time. Any other electronic device, head phones, smart watch or digital watch will not be allowed inside the examination hall. A student is well informed before his/ her exam that he/she should only carry their stationary items in a clear pouch with their roll number sheet provided by Maharashtra Board.
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.