Chemistry

This is a complete, free study companion for Chemistry — built around what the exam actually asks. The topics examiners repeat most are First order reaction calculations: k, t1/2 and concentration remaining, IUPAC nomenclature of coordination compounds, and Tests for aldehydes and ketones: Tollens, Fehling, iodoform and 2,4-DNP. The syllabus runs to 10 chapters. Below you'll find the full topic-frequency ranking, the exam paper pattern, every chapter, a step-by-step study plan, and the official downloads — everything in one place.

Everything here is free. We're an independent student resource, not the official ICSE & ISC body, so always confirm the current syllabus and exam dates on the official ICSE & ISC website before you rely on them.

Key information

Level: Class 12
Programme: CL12
Stream: Science
Exam: Indian School Certificate
Conducted by: Council for the Indian School Certificate Examinations (CISCE)

Most frequently examined topics

#	Topic	Times asked
1	First order reaction calculations: k, t1/2 and concentration remaining	5
2	IUPAC nomenclature of coordination compounds	5
3	Tests for aldehydes and ketones: Tollens, Fehling, iodoform and 2,4-DNP	5
4	Aldol condensation and Cannizzaro reaction	5
5	Diazotisation and benzene diazonium chloride reactions	5
6	Molarity, molality, mole fraction and concentration calculations	4
7	Elevation in boiling point and depression in freezing point numericals	4
8	Galvanic cell notation, electrode reactions, anode and cathode	4
9	Standard cell emf calculation	4
10	Nernst equation and non-standard cell potential	4
11	Rate law, order, molecularity and units of rate constant	4
12	Variable oxidation states of transition elements	4

Counted across the official previous-year question papers we have analysed for this subject. It shows what has been asked before — it does not predict what will appear in your exam. Always confirm the current syllabus on the official portal.

What you will study (chapters)

Chapter 1: Solutions
Chapter 2: Electrochemistry
Chapter 3: Chemical Kinetics
Chapter 4: d- and f-Block Elements
Chapter 5: Coordination Compounds
Chapter 6: Haloalkanes and Haloarenes
Chapter 7: Alcohols, Phenols and Ethers
Chapter 8: Aldehydes, Ketones and Carboxylic Acids
Chapter 9: Organic Compounds Containing Nitrogen
Chapter 10: Biomolecules

Official textbook

Chemistry — official textbook / study material — Free download from the official source.

How to study Chemistry and score well

Start with the highest-frequency topics — In Chemistry, First order reaction calculations: k, t1/2 and concentration remaining, IUPAC nomenclature of coordination compounds, Tests for aldehydes and ketones: Tollens, Fehling, iodoform and 2,4-DNP, and Aldol condensation and Cannizzaro reaction appear again and again in past papers. Master these first — they return the most marks for the time you put in.
Practise with previous-year papers — Solve the last 5–10 years of ICSE & ISC Chemistry papers under timed, exam-like conditions. Past papers show exactly which topics repeat and how questions are worded.
Revise actively, not passively — Write a one-page summary for each of the 10 chapters — key definitions, formulas and the points examiners reward — then re-test yourself instead of re-reading.
Mark your answers with the official scheme — After each practice paper, score yourself against the official marking scheme. It shows how marks are awarded step-by-step, so you learn to present answers the way examiners expect.

Exam tips: how to score higher in Chemistry

Where students lose marks: rushing the high-weightage questions, skipping the steps the marking scheme rewards, and saving easy sections for last. Read the whole paper first, attempt your strongest section early to bank marks, and always show your working.

Manage your time: split your time in proportion to the marks each section carries, keep a few minutes at the end to check, and never leave a question blank — a partial, structured answer still earns partial marks.

Frequently asked questions

What are the most important topics in Chemistry?

Based on past papers, the most frequently asked topics include First order reaction calculations: k, t1/2 and concentration remaining, IUPAC nomenclature of coordination compounds, Tests for aldehydes and ketones: Tollens, Fehling, iodoform and 2,4-DNP. The full ranked list with how often each appears is in the "Most important topics" section above.

Where can I download Chemistry previous-year question papers?

Official ICSE & ISC previous-year question papers are available on the official ICSE & ISC website. Open the Question Papers section for the direct link, plus the exam pattern and the topics that repeat most.

How can I prepare for Chemistry faster?

Start with the highest-frequency topics, learn the exam pattern so you know how each section is marked, and practise with past papers. A subject-aware study tutor can quiz you on exactly these topics.

A Gyani AI tutor trained on the Chemistry syllabus and past papers can quiz you on the most-asked topics and show you exactly what to revise.