ISC Class 12 Chemistry Weightage 2026: Unit, Practical Exam, Question Pattern
Roshni Yadav22 Dec, 2025
ISC Class 12 Chemistry Weightage 2026 refers to the marks allocated to each unit or chapter and different assessment components in the board examination.
Knowing this weightage guides your study plan. It allows you to focus more on high-scoring areas. This strategic approach helps optimize preparation and achieve better results in the final exam.
The ISC Class 12 Chemistry examination includes both theory and practical components. Students must understand the weightage of the chemistry Class 12 ISC 2026 for each part.
This section details the breakdown for both the theory paper and the practical assessment.
ISC Class 12 Chemistry Chapter-Wise Weightage 2026 Theory Paper
The theory paper carries 70 marks and lasts 3 hours. It is divided into four sections: A, B, C, and D. These sections have different mark distributions and may include internal choices. The paper covers Physical, Inorganic, and Organic Chemistry.
ISC Class 12 Chemistry Unit-wise Marks Distribution
The table below shows the estimated ISC Class 12 Chemistry chapter-wise weightage 2026 for the theory paper. This distribution helps in planning your study schedule effectively.
| ISC Class 12 Chemistry Chapter-Wise Weightage Theory Paper | |
|---|---|
| Unit | Approximate Marks |
| Unit 1: Some Basic Concepts of Chemistry | 4 |
| Unit 2: Structure of Atom | 4 |
| Unit 3: Classification of Elements and Periodicity in Properties | 4 |
| Unit 4: Chemical Bonding and Molecular Structure | 6 |
| Unit 5: States of Matter | 4 |
| Unit 6: Thermodynamics | 4 |
| Unit 7: Equilibrium | 4 |
| Unit 8: Redox Reactions | 5 |
| Unit 9: Hydrogen and its Compounds | 5 |
| Unit 10: s-Block Elements | 4 |
| Unit 11: Some p-Block Elements | 4 |
| Unit 12: Organic Chemistry | 6 |
| Unit 13: Environmental Chemistry | 3 |
| Unit 14: Chemical Industries | 5 |
ISC Class 12 Chemistry Weightage 2026 Practical Assessment
The practical assessment is worth 30 marks. It includes the practical exam, project work, and maintaining a practical file. Proper attention to each of these parts is crucial for a complete score. The ISC Class 12 chemistry chapter-wise weightage in practicals focuses on experimental skills.
ISC Class 12 Chemistry Practical Paper Evaluation Criteria
The practical exam assesses various experimental skills. It carries a total of 15 marks. The questions are designed to test your understanding and application of laboratory techniques.
| ISC Class 12 Chemistry Weightage Practical Assessment | |
|---|---|
| Particulars | Details |
| Experiments | Titrations, Rate of reaction, Identification of compounds and functional groups based on observations, Tests of Carbohydrates and Proteins, pH change using pH paper or universal indicator, Electrochemistry, Qualitative analysis |
| Total Marks | 15 marks |
| Question pattern | Question 1: Volumetric analysis, Question 2: Combination of the experiments, Question 3: Qualitative analysis |
Project Work Evaluation Criteria
Project work and practical file maintenance contribute significantly to the overall practical marks. The evaluation criteria for these components are detailed below. This forms an important part of the overall weightage of the chemistry class 12 ISC 2026.
| ISC Class 12 Chemistry Weightage Practical Assessment | ||
|---|---|---|
| Assessment | Criteria | Marks |
| Project Work | Introduction, Contents, Analysis/material aid, Presentation, Bibliography | 10 marks |
| Practical File | Performance based on the practical file maintained. | 5 marks |
| Total | 15 marks | |
ISC Class 12 Chemistry Question Format 2025–26
The ISC Class 12 Chemistry Question Format 2025–26 explains how questions are divided across sections with different mark values. Understanding the weightage of Chemistry Class 12 ISC 2026 helps students focus on high-scoring sections and prepare answers according to the exam pattern.
| ISC Class 12 Chemistry Question Format 2025–26 |
||||
|---|---|---|---|---|
| Section | Question Type | Number of Questions | Marks per Question | Total Marks |
| Section A | Objective / MCQs | 18 | 1 | 18 |
| Section B | Short Answer | Approx. 9 | 2 | 18 |
| Section C | Short to Long Answer | Approx. 7 | 3 | 21 |
| Section D | Long Answer | Approx. 4 | 4 | 16 |
| Section E | Essay / Descriptive | 2 | 5 | 10 |
Related Links
| ISC Class 12 Chemistry Weightage 2026 | ISC Class 12 Maths Weightage 2026 |
| ISC Class 12 Physics Weightage 2026 | ISC Class 12 Biology Weightage 2026 |
| ISC Class 12 English Weightage 2026 |