In case you are studying without knowing the Chemistry Class 12 2026 pattern of weightage, you are studying blindly. The Chemistry Class 12 exam is divided into three sections.
- Physical
- Inorganic
- Organic Chemistry
It is this division that decides where to devote your preparation time. Organic Chemistry alone carries 33 marks. That is almost half the theory paper.
Here is the breakdown of the unit-wise important topics of Chemistry Class 12 syllabus for 2026, straight from CBSE’s official framework.
The Chemistry Class 12 2026 Paper at a Glance
There are 33 questions in the Chemistry class 12 question paper, out of which there are 5 sections, and the total marks for theory are 70. You are not allowed to use any calculators or log tables.
| Section | Question Type | No. of Questions | Marks Each | Total |
| A | MCQs | 16 | 1 | 16 |
| B | Very Short Answer | 5 | 2 | 10 |
| C | Short Answer | 7 | 3 | 21 |
| D | Case-Based | 2 | 4 | 8 |
| E | Long Answer | 3 | 5 | 15 |
| Total | 33 | 70 |
Section E: carries 15 marks across just 3 questions. These long answers reward students who write structured, point-by-point responses – not essays.
According to the analysis at Aakash, section A’s 16 MCQs pull heavily from:
- Electrochemistry,
- Coordination Compounds
- Chemical Kinetics
So, conceptual gaps in any of these chapters will cost you marks before you even reach the descriptive section. Focus on these first if you have gaps, then move on to cover other chapters like amines, biomolecules, etc.
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Physical Chemistry Weightage (23 Marks)
Physical Chemistry contributes 23 marks through 3 Chemistry class 12 chapters, and most of the marks here are numerical. This is where prepared students pick up clean, consistent marks and underprepared ones drop 8-10 in one go.
| Chapter | Marks |
| Solutions | 7 |
| Electrochemistry | 9 |
| Chemical Kinetics | 7 |
| Total | 23 |
- Electrochemistry (9 marks)
The single highest-weightage chapter in the entire Class 12 chemistry syllabus. Nernst equation, Kohlrausch’s Law, cell EMF, conductance, and electrolysis are exam fixtures both as MCQs and 3-mark numericals.
- Solutions (7 marks)
Colligative properties, Van’t Hoff factor, Raoult’s Law. Expect numerical + concept MCQ combinations.
- Chemical Kinetics (7 marks)
Integrated rate equations, Arrhenius equation, order of reactions. These are formula-dependent questions. Reading them without pen-and-paper practice will not prepare you for exam conditions.
At Aakash, after working with lakhs of Chemistry Class 12 students, Physical Chemistry is consistently where the most preventable marks are lost. A formula not practised under timed conditions is a formula forgotten mid-paper.
Inorganic Chemistry Weightage (14 Marks)
Inorganic Chemistry has the lowest mark weight at 14, yet it is where the students tend to lose the most marks, which they are not supposed to.
Two chapters, which are well covered in the NCERT books, are both heavily tested on MCQs and short answers.
| Chapter | Marks |
| d- and f-Block Elements | 7 |
| Coordination Compounds | 7 |
| Total | 14 |
- d- and f-Block Elements
Colour, magnetic properties, oxidation states, catalytic behaviour, and lanthanoid contraction are repeat targets across every Chemistry previous year question paper class 12 from the last 5 years.
- Coordination Compounds
IUPAC naming, types of isomerism (especially geometrical and optical), and the basics of VBT and CFT. Isomerism alone accounts for 2–3 marks and is skipped by a majority of students, every year, without exception.
Inorganic chemistry has only minor formula-based questions and calculation-heavy numericals. Every mark lost here is a memory and clarity issue. Both are fixable with two focused revision sessions.
Organic Chemistry Class 12 Weightage (33 Marks)
Organic Chemistry carries 33 marks – 47% of the entire theory paper.
| Chapter | Marks |
| Haloalkanes and Haloarenes | 6 |
| Alcohols, Phenols and Ethers | 6 |
| Aldehydes, Ketones and Carboxylic Acids | 8 |
| Amines | 6 |
| Biomolecules | 7 |
| Total | 33 |
- Aldehydes, Ketones & Carboxylic Acids (8 marks)
The heaviest Class 12 organic chemistry chapter. Aldol condensation, Cannizzaro reaction, and nucleophilic addition mechanisms are non-negotiable.
- Biomolecules (7 marks): Almost pure theory
Glucose structure, DNA vs RNA, enzyme action, vitamins. These are some of the most predictable marks in the paper. Students who skip this chapter in favour of “harder” chapters are leaving 7 marks on the table.
- Haloalkanes + Amines
These are mechanism-first chapters. A clean, drawn SN2 mechanism earns full marks. A written paragraph about substitution reactions earns half. Draw mechanisms; do not describe them.
One rule for all of Class 12 Organic Chemistry: if you cannot write a named reaction from memory, you are not yet revision-ready for that topic.
How to Use the Weightage to Plan Your Preparation in a Week?
Knowing the pattern is only useful if it translates into time allocation. Based on marks, weight, and student performance data across lakhs of Aakash students, here is how to divide your revision:
- Organic Chemistry (33 marks)
3 days. Prioritise named reactions, mechanisms, and distinction tests above everything else
- Physical Chemistry (23 marks)
2-3 days. Practise every numerical type at least twice on paper, not just conceptually
- Inorganic Chemistry (14 marks)
1-2 days. Primarily focused on isomerism, oxidation states, and lanthanoid contraction
Class 12 chemistry solutions (mock tests): Solve at least 2 full sample papers under timed, no-notes conditions before the board exam.
FAQs
Q1. Is the Chemistry Class 12 syllabus identical across all CBSE-affiliated schools for 2026?
CBSE centrally issues the Class 12 chemistry syllabus, and it is similar throughout all schools that are affiliated in India.
Q2. How much do practicals contribute, and can they offset a weaker theory score?
Practicals mark 30 out of 100. A score of 27-28 is attainable through regular lab effort. This leaves you with a target of approximately 63-64 marks in order to still score 90+ overall marks in the Chemistry Class 12 exam.
Q3. Can MCQs in Section A be solved without NCERT class 12 chemistry book exercises?
Not reliably. Analysis of the Chemistry previous year question paper class 12 across 5 years shows the majority of questions trace directly back to NCERT concepts. Sample papers add the application layer, but NCERT is always the base.
