ISC Class 12 Chemistry — Guess Paper & Important Questions 2027
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Everything for Chemistry in one place — guess paper, important questions and chapter-wise important topics for the 2027 exam, from analysis of 4 board + 5 official sample papers (2023–2027).
Guess Paper 2027
A full 34-question paper on the official pattern, built from the most-likely questions.
Open guess paper PDFImportant Questions
78 question patterns that have repeated across past papers.
See repeated questions PDFImportant Topics
Every chapter’s topics ranked by how often and how recently they were asked.
See important topicsTop 5 topics
| # | Topic | Chapter | Importance |
|---|---|---|---|
| 1 | Arrhenius equation, activation energy from temperature coefficient | Chemical Kinetics | ★★★★★ |
| 2 | coordination number and oxidation number | Coordination Compounds | ★★★★☆ |
| 3 | Clemmensen reduction | Aldehydes, Ketones and Carboxylic Acids | ★★★★☆ |
| 4 | Kohlrausch's law of independent migration | Electrochemistry | ★★★★☆ |
| 5 | reaction of alkyl halides with KCN and AgCN | Haloalkanes and Haloarenes | ★★★☆☆ |
ISC Class 12 Chemistry exam pattern 2027
Key facts
- Maximum marks: 70
- Duration: 3 hours
- Sections: 4 (A, B, C, D)
- Exam: 2027 ISC Class 12 board exam
| Section | What is asked | Marks |
|---|---|---|
| A | Compulsory. Question 1 is made up of fourteen subparts of 1 mark each: (A) four fill-in-the-blank questions, (B) seven multiple-choice questions (including assertion-reason), and (C) three passage/case-based short questions. | 14 |
| B | Ten short-answer questions of 2 marks each. Internal choice is provided in two of the questions. | 20 |
| C | Seven questions of 3 marks each, typically split into sub-parts (short derivations, conversions, numericals and reasoning). Internal choice is provided in two of the questions. | 21 |
| D | Three long-answer questions of 5 marks each, made up of multi-part identification, mechanism, numerical and reasoning sub-parts. Internal choice is provided in two of the questions. | 15 |
ISC Class 12 Chemistry chapter-wise weightage 2027
| Unit | Chapters | Marks |
|---|---|---|
| Physical Chemistry | Solutions, Electrochemistry, Chemical Kinetics | 25 |
| Inorganic Chemistry | d- and f-Block Elements, Coordination Compounds | 14 |
| Organic Chemistry | Haloalkanes and Haloarenes, Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds containing Nitrogen, Biomolecules | 31 |
Unit marks as given in the official syllabus.
Frequently asked questions
Is this the real ISC Class 12 Chemistry guess paper 2027?
No. It is a practice guess paper built by analysing which questions and topics repeat across 4 board + 5 official sample papers (2023–2027) for ISC Class 12 Chemistry. It follows the latest official exam pattern but is not an official or leaked paper.
What is the ISC Class 12 Chemistry exam pattern for 2027?
The ISC Class 12 Chemistry 2027 paper is 70 marks and 3 hours long, in 4 sections: Section A — Compulsory; Section B — Ten short-answer questions of 2 marks each; Section C — Seven questions of 3 marks each, typically split into sub-parts (short derivations, conversions, numericals and reasoning); Section D — Three long-answer questions of 5 marks each, made up of multi-part identification, mechanism, numerical and reasoning sub-parts. Highest-weightage units: Organic Chemistry (31 marks), Physical Chemistry (25 marks), Inorganic Chemistry (14 marks).
How many questions repeat in ISC Class 12 Chemistry?
We found 78 question patterns that appeared in two or more of the analysed papers (4 board + 5 official sample papers). The most-repeated ones are listed on the Important Questions page.
What are the most important topics for ISC Class 12 Chemistry 2027?
The top topics by repetition are Arrhenius equation, activation energy from temperature coefficient; coordination number and oxidation number; Clemmensen reduction. The full ranked list is on the Important Topics page.
Where can I see the ISC Class 12 Chemistry guess paper?
The full 34-question guess paper is on the Guess Paper page — free to view, with each question tagged by chapter and how often it has appeared in past papers.