Chemistry Class 12 Marks Distribution with Weightage 2025

Students can also refer to the article below to get an idea about the chemistry Class 12 marks distribution of CBSE, ISC, Bihar board and Maharashtra HSC board.

CBSE 12th Chemistry Board Exam Weightage: Chemistry is one of the important subjects for Class 12 students who have opted for the science stream. Though the subject is considered a difficult one, students can score high in it with a thorough understanding of the chapters and concepts.  A candidate has to score a minimum 33 per cent aggregate marks to pass CBSE Class 12 board exams 2025. Also, the candidate must secure at least 33 per cent marks in each subject to pass the board exam. Candidates who secure 33 per cent or above aggregate marks but scored less than 33 per cent in any subject have to appear for the Class 12 supplementary exam. 

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We have provided CBSE, ISC Class 12 chapter-wise weightage of chemistry subject on this page. The Central Board of Secondary Education (CBSE) has released sample papers for Class 12 board exams 2024. Sample Question Papers with detailed designs of the CBSE Class 12th Question Paper can be checked on CBSE official website. 

Also read: 

• CBSE Class 12 Chemistry Model Paper 2023 PDF Download 
• CBSE Class 12 Chemistry Sample Paper 2023 PDF Download 

CBSE Class 12 Chemistry Weightage 2025

Candidates can perform well in the CBSE Class 12 Chemistry exam 2025 by focusing on important topics. Below is the unit-wise distribution of marks for the CBSE Class 12 Chemistry exam.  

Unit	Marks
Solutions	7
Electrochemistry	9
Chemical Kinetics	7
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
Total	70

ISC Class 12 Chemistry Weightage 2025

The weightage of each chapter helps the students score good in Chemistry Class 12 ISC Board exam. Below is the unit-wise distribution of marks for the ISC Class 12 Chemistry exam.  

Unit	Marks Distribution
Solutions	Physical Chemistry  25 Marks
Electrochemistry
Chemical Kinetics
d-and-f-Block Elements	Inorganic Chemistry  14 Marks
Coordination Compounds
Haloalkanes and Haloarenes	Organic Chemistry  31 Marks
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic acids
Organic Compounds Containing Nitrogen
Biomolecules
Total Marks	70

Also read: 

• ISC Exam Pattern 2023: Get Latest Paper Pattern & Marking Scheme Here! 
• ISC Syllabus 2023 (Released): Download Reduced Class 12 ISC Syllabus PDF Here! 

Bihar Board 12th Chemistry Weightage 2025

The understanding of Bihar Board Class 12th Chemistry Weightage is a must, so that the students can make a preparation plan to clear the Class 12 Bihar Board chemistry exam with good grade. Below is the unit-wise distribution of marks for the Bihar Board (BSEB) chemistry exam.  

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

Also read: 

• BSEB 12th Board Exams 2023: Result (Released), Dates, Admit Card, Syllabus, Sample Papers 

Maharashtra HSC Chapter-wise weightage for Chemistry 2025

Below is 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

Class 12 Preparation Tips  2025

Appearing for Class 12 board exams 2025 is one of the important stages in a student’s life as admissions to higher classes depend on the performance of candidates in Class 12 boards. Below are some important preparation tips for the board exams.  

• Students must check the Class 12 syllabus 2025 properly before starting preparing for the exams.  
• They must practice mock tests as this will help them understand the exam pattern and nature of questions. They can also practice sample papers. 
• They must prepare a timetable and follow it religiously. Set targets for each subject to complete the syllabus and revision.   
• Make sure that you get sound sleep of at least seven hours every night before the examination.   
• Proper intake of food to remain in good health before the examination is very important.   
• Taking small breaks in between studies. It will help you remain stress-free, especially during the exam session.   

Read more: 

• Class 12 maths marks distribution 2025
• CBSE Sample Paper Class 12 Daily Practice Question