Chemistry is one of the most significant subjects within the BSEB Class 12 Science stream and provides an essential foundation for many advanced studies such as NEET, JEE, BCECE, Pharmacy, Biotechnology, Agriculture, and many Medical Science programs. The BSEB Chemistry examination tests a candidate's grasp of the principles of Physical, Organic, and Inorganic Chemistry, but it also emphasizes the need for conceptual clarity, the accuracy of numerical computations, and the capacity to relate the application of theory to both reaction mechanisms and other chemical-related issues.
The complete guide to the 2026 BSEB Chemistry examination includes important information concerning the date of examination, updated syllabus content, the marking scheme for evaluation, Chapter-Wise Weightage breakdown, and the relationship between previous years' examinations. The guide is intended to provide students with the tools they need to prepare adequately and successfully pass the exam.
The Bihar School Examination Board, or BSEB as it is commonly referred to, conducts the Intermediate (Class 12) annual examinations for all Science, Arts, and Commerce streams. Chemistry can be very rewarding as a subject to study; however, there are many aspects of the subject area (such as reaction mechanisms) that require constant revision on the part of the student, and as a result, the student must remain diligent in their studies and review frequently so that they obtain maximum benefit from Chemistry.
Below is the complete overview of the BSEB Chemistry exam:
BSEB conducts the annual theory exams every February, with practical exams in January.
Note: Chemistry is usually scheduled during the second week of February. Students must stay updated with official notices.
The BSEB Chemistry syllabus is fully NCERT-aligned, covering Physical, Organic, and Inorganic Chemistry. A total of 16 chapters are included, with significant weightage for numerical and mechanism-based questions.
Topics include:
Topics include:
Topics include:
Important Units & Topics to Master
The total Chemistry marks are 100, divided into 70 marks theory and 30 marks practical.
OMR Section (35 Marks)
Subjective Writing Section (35 Marks)
Includes:
Passing Criteria:
Minimum 30% overall in theory + practical combined.
BSEB follows a balanced structure, but certain chapters appear more frequently.
High-Priority Chapters
To score 60+/70 in the BSEB Chemistry paper, students must follow a systematic approach covering theory, mechanisms, reactions, and numericals.
Master Named Reactions
Create a reaction notebook covering:
Examples: Aldol Condensation, Cannizzaro Reaction, Sandmeyer Reaction.
Focus on Numerical Practice (Physical Chemistry)
Practice essential topics like:
Strong Inorganic Chemistry Fundamentals
Focus on:
Mechanisms + Conversions (Organic Chemistry)
Practice:
Solve PYQs (Previous Year Questions)
Solve at least 5–7 past papers in exam conditions.
Practising PYQs helps students understand exam difficulty, chapter-wise distribution, and important reaction patterns.
(Session 2026 - 27)