Each chapters and topics in BSEB 12th Chemistry exam has different weightage. Knowing about the weightage helps students prioritise topics accordingly. Check here BSEB 12th Chemistry Weightage 2026!
Table of Contents
The Bihar Board of Secondary Education (BSEB) will conduct the BSEB 12th Chemistry Exam 2026 for 100 marks. The theory examination is held for 3 hours and 15 minutes and carries 70 marks, while 30 marks are reserved for practical assessment. The passing mark for each chemistry theory and practical exam component is 30%. While preparing for the Bihar Board 12th Chemistry Exam 2026 you should know which topics are given major emphasis in terms of weightage to gain more marks.
Chapters such as p-block Elements (11.43%) and Aldehydes, Ketones, and Carboxylic Acids (8.57%) carry the highest weightage in the Bihar Board Class 12 Chemistry theory paper and should be given priority during preparation. In Physical Chemistry, units like Electrochemistry, Solutions, and Chemical Kinetics contribute 7.14% each, making them important scoring areas. At the same time, you should not completely ignore lower-weightage units, as questions are distributed across the entire syllabus. Additionally, Section A alone carries 50% of the total theory marks, making objective-type questions a crucial component for maximizing scores.
By placing your main focus on the units/chapters with the greatest weightage, you will cover a large portion of your syllabus and will therefore drastically increase your aggregate Chemistry score. You can see additional details of the weightage of units for the BSEB 12th Chemistry Exam 2026 below.
BSEB 12th Chemistry Exam Pattern 2026
The BSEB Class 12 Chemistry theory paper will be conducted for 70 marks and will include 96 questions divided into two sections. You must attempt questions strictly as per the prescribed pattern. Section A carries the highest weightage of 35 marks, making objective questions a key scoring area. More details below:
|
Section |
Question Type |
Questions to Attempt |
Marks per Question |
Total Marks |
Weightage |
|
Section A |
Objective-type |
35 out of 70 |
1 mark |
35 |
50% |
|
Section B |
Short-answer |
10 out of 20 |
2 marks |
20 |
28.57% |
|
Long-answer |
3 out of 6 |
5 marks |
15 |
21.43% |
|
|
Total |
— |
— |
— |
70 Marks |
100% |
Also Read: BSEB 12th Chemistry Exam Pattern 2026
BSEB 12th Chemistry Unit-Wise Weightage 2026
The BSEB Class 12 Chemistry theory paper is worth 70 marks and includes questions from 16 different units. Unit 7 (p-block Elements) has the highest weightage of any unit, with 11.43%, making it particularly important for scoring. Understanding unit weightage can help students plan their revision more strategically.
|
Unit |
Chapters |
Marks |
Weightage |
|
Unit 1 |
Solid State |
04 |
5.71% |
|
Unit 2 |
Solutions |
05 |
7.14% |
|
Unit 3 |
Electrochemistry |
05 |
7.14% |
|
Unit 4 |
Chemical Kinetics |
05 |
7.14% |
|
Unit 5 |
Surface Chemistry |
04 |
5.71% |
|
Unit 6 |
General Principles and Processes of Isolation of Elements |
03 |
4.29% |
|
Unit 7 |
p-block Elements |
08 |
11.43% |
|
Unit 8 |
d and f-block Elements |
05 |
7.14% |
|
Unit 9 |
Coordination Compounds |
03 |
4.29% |
|
Unit 10 |
Haloalkanes and Haloarenes |
04 |
5.71% |
|
Unit 11 |
Alcohols, Phenols, and Ethers |
04 |
5.71% |
|
Unit 12 |
Aldehydes, Ketones, and Carboxylic Acids |
06 |
8.57% |
|
Unit 13 |
Organic Compounds Containing Nitrogen |
04 |
5.71% |
|
Unit 14 |
Biomolecules |
04 |
5.71% |
|
Unit 15 |
Polymers |
03 |
4.29% |
|
Unit 16 |
Chemistry in Everyday Life |
03 |
4.29% |
|
Total |
— |
70 Marks |
100% |
Also Read: Bihar Board 12th Chemistry Syllabus 2026
BSEB 12th Chemistry Chapter-Wise Weightage 2026
The Bihar Board Class 12 Chemistry theory paper is conducted for 3 hours and 15 minutes and carries a total of 70 marks. The syllabus is divided into 16 units, covering Physical, Inorganic, and Organic Chemistry. Among all units, p-block Elements, ketones, and carboxylic acids, and key Physical Chemistry chapters carry relatively higher weightage, making them important from an exam perspective.
|
Unit |
Chapter |
Key Topics Covered |
Marks |
Weightage |
|
Unit 1 |
Solid State |
Types of solids, unit cell, packing efficiency, defects, electrical & magnetic properties |
04 |
5.71% |
|
Unit 2 |
Solutions |
Types of solutions, concentration terms, solubility, colligative properties, abnormal molecular mass |
05 |
7.14% |
|
Unit 3 |
Electrochemistry |
Redox reactions, conductivity, Kohlrausch’s law, electrochemical cells, Nernst equation, corrosion |
05 |
7.14% |
|
Unit 4 |
Chemical Kinetics |
Rate of reaction, order & molecularity, rate law, half-life, collision theory |
05 |
7.14% |
|
Unit 5 |
Surface Chemistry |
Adsorption, catalysis, enzymes, colloids, emulsions, Tyndall effect |
04 |
5.71% |
|
Unit 6 |
General Principles and Processes of Isolation of Elements |
Methods of extraction, metallurgy of Al, Cu, Zn, Fe |
03 |
4.29% |
|
Unit 7 |
p-block Elements |
Groups 15–18, properties, compounds of nitrogen, phosphorus, sulphur, halogens, noble gases |
08 |
11.43% |
|
Unit 8 |
d and f-block Elements |
Transition metals, properties, KMnO₄, K₂Cr₂O₇, lanthanoids, actinoids |
05 |
7.14% |
|
Unit 9 |
Coordination Compounds |
Ligands, nomenclature, bonding theories, isomerism, applications |
03 |
4.29% |
|
Unit 10 |
Haloalkanes and Haloarenes |
Nomenclature, reactions, mechanisms, environmental effects of halogen compounds |
04 |
5.71% |
|
Unit 11 |
Alcohols, Phenols, and Ethers |
Preparation, properties, reactions, identification tests, uses |
04 |
5.71% |
|
Unit 12 |
Aldehydes, Ketones, and Carboxylic Acids |
Carbonyl chemistry, nucleophilic addition, acidity, preparation, uses |
06 |
8.57% |
|
Unit 13 |
Organic Compounds Containing Nitrogen |
Amines, diazonium salts, reactions, identification, uses |
04 |
5.71% |
|
Unit 14 |
Biomolecules |
Carbohydrates, proteins, vitamins, enzymes, DNA & RNA |
04 |
5.71% |
|
Unit 15 |
Polymers |
Classification, polymerisation methods, biodegradable polymers |
03 |
4.29% |
|
Unit 16 |
Chemistry in Everyday Life |
Medicines, food additives, soaps & detergents |
03 |
4.29% |
|
Total |
— |
— |
70 |
100% |
Also Read: BSEB 12th Chemistry Deleted Syllabus 2026
BSEB 12th Chemistry Internal Assessment Weightage 2026
The BSEB 12th Chemistry Internals, which include experiments, practical records, and viva, carry 30 marks out of 100. In this assessment, experiments hold the highest weightage of 50%, making them the most crucial component. You must secure a minimum of 30% marks overall by combining theory and practical scores in order to pass the exam.
|
Component |
Marks |
Weightage |
|
Experiments |
15 |
50% |
|
Practical Record |
5 |
16.67% |
|
Viva Voce |
5 |
16.67% |
|
Attendance / Project |
5 |
16.67% |
|
Total |
30 |
100% |
Also Read: Bihar Board 12th Previous Year Question Papers
How to Score High using BSEB 12th Chemistry Weightage 2026 ?
Given below are the exam-focused points to help you score high using the BSEB 12th Chemistry Weightage 2026:
- When preparing for this exam, the chapters that account for a significant portion of the mark allocation should be given priority. By prioritizing them, you will increase your chances of earning the highest possible score.
- Since Section A accounts for half of the total marks allotted to theory, you should concentrate especially on this section and regularly practice responding to objective-type questions in order to receive more easy and quick marks.
- While it's important to concentrate on high-weightage units, you also need to make sure that you consider the entire syllabus and practice all of the material equally. You have an equal chance of receiving marks for each of the sixteen units in the syllabus. Low-weightage units must therefore be treated with the same importance as the other high-weightage chapters.
- Don't forget about the practical/internal assessment component, which makes up 30 of the final score. If you do well in experiments, reports, and viva, you will increase your overall score and raise your chances of getting a higher grade.
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