Chemistry

This is a complete, free study companion for Chemistry — built around what the exam actually asks. The topics examiners repeat most are BCC (body centred cubic) geometry relation: r–a formula, Substitutional impurity defect (solid state), and Interstitial impurity defect (solid state). The syllabus runs to 16 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 Maharashtra Board body, so always confirm the current syllabus and exam dates on the official Maharashtra Board website before you rely on them.

Key information

Level: Class 12
Programme: CL12
Stream: Science
Exam: Higher Secondary Certificate
Conducted by: MSBSHSE

Most frequently examined topics

#	Topic	Times asked
1	BCC (body centred cubic) geometry relation: r–a formula	1
2	Substitutional impurity defect (solid state)	1
3	Interstitial impurity defect (solid state)	1
4	Interstitial compounds + alloy classification with examples	1
5	FCC density calculation (silver)	1
6	Cryoscopic constant: SI unit	1
7	Molar conductivity of electrolytes (numerical)	1
8	Raoult’s law / mole fraction from vapour pressure (numerical)	1
9	Osmosis + molar mass by elevation of boiling point	1
10	pH to [OH−] for weak monoacidic base (numerical)	1
11	Acidic buffer solution + solubility–Ksp relation (PbI2)	1
12	Percent dissociation change with concentration (numerical)	1

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: Solid State
Chapter 2: Solutions
Chapter 3: Ionic Equilibria
Chapter 4: Chemical Thermodynamics
Chapter 5: Electrochemistry
Chapter 6: Chemical Kinetics
Chapter 7: Elements of Groups 16, 17 and 18
Chapter 8: Transition and Inner Transition Elements
Chapter 9: Coordination Compounds
Chapter 10: Halogen Derivatives
Chapter 11: Alcohols, Phenols and Ethers
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
Chapter 13: Amines
Chapter 14: Biomolecules
Chapter 15: Introduction to Polymer Chemistry
Chapter 16: Green Chemistry and Nanochemistry

How to study Chemistry and score well

Start with the highest-frequency topics — In Chemistry, BCC (body centred cubic) geometry relation: r–a formula, Substitutional impurity defect (solid state), Interstitial impurity defect (solid state), and Interstitial compounds + alloy classification with examples 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 Maharashtra Board 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 16 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 BCC (body centred cubic) geometry relation: r–a formula, Substitutional impurity defect (solid state), Interstitial impurity defect (solid state). 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 Maharashtra Board previous-year question papers are available on the official Maharashtra Board 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.