CBSE Class 12 Chemistry Syllabus and Weightage 2026 – Chapter Wise Marks Distribution
- Divya Shinde
- 2 days ago
- 4 min read
Chemistry is a core subject for students in Class 12 Science. Not only is it crucial for board exams, but it also sets the foundation for competitive exams like NEET, JEE, and undergraduate science degrees. To perform well in the 2026 board exams, students need to understand both the syllabus topics and how marks are distributed across those topics — that’s why knowing the CBSE Class 12 Chemistry Syllabus and Weightage 2026 is essential.
The syllabus is structured into physical, inorganic, and organic chemistry, and the board provides a detailed exam pattern and marking scheme so students can prepare in a targeted way. In this blog, we’ll explore each unit, explain the marks distribution, and share how you can prioritize your studies for maximum impact.
CBSE Class 12 Chemistry Exam Pattern 2026
Before diving into the chapters, it’s important to understand the exam structure.
Theory Exam – 70 Marks
The theory paper covers 70 marks and tests students through a mix of question types:
MCQs: 16 questions × 1 mark = 16
Very Short Answer (VSA): 5 × 2 marks = 10
Short Answer (SA): 7 × 3 marks = 21
Case-based questions: 2 × 4 marks = 8
Long Answer (LA): 3 × 5 marks = 15
This comprehensive format ensures students are evaluated on conceptual understanding, application, and analytical skills.
Practical/Internal Assessment – 30 Marks
Practical exams test lab skills and real-world application:
Volumetric Analysis – 8
Salt Analysis – 8
Content-Based Experiment – 6
Project Work – 4
Class Record & Viva – 4
Total Practical: 30 Marks
CBSE Class 12 Chemistry Syllabus 2026: Full Unit Wise Topics
Here’s an updated breakdown of all the units included in the CBSE Class 12 Chemistry Syllabus and Weightage 2026:
Physical Chemistry
Solutions
Types of solutions
Concentration measures
Colligative properties
Raoult’s Law
Van’t Hoff factor
Electrochemistry
Redox reactions and EMF of the cell
Standard electrode potential
Nernst equation
Conductivity and Kohlrausch’s law
Electrolysis and practical cells like lead accumulator and fuel cells
Chemical Kinetics
Rate of reactions
Order and molecularity
Integrated rate law
Collision theory
Activation energy concepts
Inorganic Chemistry
d- and f-Block Elements
Characteristics and properties
Important compounds and reactions
Coordination Compounds
Ligands, coordination number
Isomerism
Crystal field theory basics
Organic Chemistry
Haloalkanes and Haloarenes
Nomenclature, properties
Preparation and reactions
Alcohols, Phenols and Ethers
Structure and properties
Mechanisms of reactions
Aldehydes, Ketones and Carboxylic Acids
Nucleophilic addition and substitution
Oxidation-reduction mechanisms
Amines
Classification and basicity
Reactions and uses
Biomolecules
Carbohydrates, proteins, enzymes
Vitamins and their roles
Chapter-Wise Weightage: Marks Distribution for CBSE Class 12 Chemistry
Understanding how marks are distributed helps you prioritize topics during revision. Here’s the latest unit-wise marks weightage for the 2026 board exam:
Unit/Chapter | Marks | Approx Weightage (%) |
Solutions | 7 | ~10% |
Electrochemistry | 9 | ~13% |
Chemical Kinetics | 7 | ~10% |
d- and f-Block Elements | 7 | ~10% |
Coordination Compounds | 7 | ~10% |
Haloalkanes and Haloarenes | 6 | ~9% |
Alcohols, Phenols and Ethers | 6 | ~9% |
Aldehydes, Ketones and Carboxylic Acids | 8 | ~11% |
Amines | 6 | ~9% |
Biomolecules | 7 | ~10% |
Total Theory Marks | 70 | 100% |
This distribution provides a balanced mix across physical, inorganic, and organic chemistry. High-yield chapters like Electrochemistry and Aldehydes, Ketones and Carboxylic Acids carry slightly higher marks.
Important Tips to Prepare CBSE Class 12 Chemistry Syllabus and Weightage 2026 Effectively
Now that you know what content is important, here are some actionable tips to help you make the most of your preparation:
1. Master the NCERT Textbook
The NCERT Class 12 Chemistry book is the foundation of the board exam. Make sure you read every topic thoroughly, as most board questions are based directly on NCERT concepts.
2. Practice Previous Year Papers
Solve at least 5–10 years of past board papers. This will help you identify recurring questions, patterns, and frequently asked topics.
3. Focus on High Weightage Chapters First
Especially focus on high-mark chapters such as Electrochemistry, Aldehydes & Ketones, and Chemical Kinetics. Go beyond theory and practice numerical problems and mechanisms.
4. Revise Regularly
Set aside weekly revision slots. Chemistry has reactions and factual content that must be memorized and practiced regularly.
5. Do Practical Revision
Don’t overlook practicals — hands-on experiments and viva preparation can fetch up to 30 marks. Maintain neat records and practice experimental techniques.
Frequently Asked Questions (FAQ) on CBSE Class 12 Chemistry Syllabus and Weightage 2026
Q1: What is included in the CBSE Class 12 Chemistry Syllabus and Weightage 2026 for the board exam?
A: The CBSE Class 12 Chemistry Syllabus and Weightage 2026 includes detailed units from physical, inorganic, and organic chemistry along with their chapter-wise marks distribution and practical evaluation scheme totaling 100 marks (70 theory + 30 practical).
Q2: How many marks are allocated to Electrochemistry in the 2026 CBSE Class 12 Chemistry exam?
A: Electrochemistry carries 9 marks, making it one of the highest weightage units in the CBSE Class 12 Chemistry board exam.
Q3: Does the CBSE Class 12 Chemistry practical exam matter for final scores?
A: Yes, practical exams contribute 30 marks to the total score. Practical knowledge and proper record maintenance can significantly boost overall performance.
Q4: What question types are asked in the theory portion?
A: The theory paper includes MCQs, very short answer, short answer, case-based, and long answer questions designed to assess conceptual clarity and analytical abilities.
Conclusion
Understanding the CBSE Class 12 Chemistry Syllabus and Weightage 2026 is crucial for strategic preparation. By knowing the syllabus topics, chapter-wise marks distribution, and practical components, students can plan their studies efficiently and improve their chances of scoring high in the board exams.
Don’t just memorize — understand concepts, practice regularly, and revise intelligently. Your success in Chemistry depends on a thorough understanding of topics and consistent effort.
Useful Resources for CBSE Class 12 Chemistry 2026
Download CBSE Class 12 Chemistry Syllabus 2026 (Official PDF https://cbseacademic.nic.in
CBSE Class 12 Chemistry Previous Year Question Papers https://www.cbse.gov.in
Chapter-Wise CBSE Class 12 Chemistry Notes (Free) https://example.com/class-12-chemistry-notes
CBSE Class 12 Chemistry Sample Papers 2026 https://example.com/cbse-chemistry-sample-papers-2026
Best Reference Books for CBSE Class 12 Chemistry https://example.com/best-books-class-12-chemistry
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