Maharashtra Board Class 12 Chemistry Important Topics 2027
Every topic ranked by how often and how recently it was asked in 8 past board papers (2022–2026).
Top 10 most important topics
| # | Topic | Chapter | Asked in | Importance |
|---|---|---|---|---|
| 1 | First law and enthalpy changes | Chemical Thermodynamics | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| 2 | Preparation and properties of haloalkanes/haloarenes | Halogen Derivatives | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| 3 | Werner's theory and terminology | Coordination Compounds | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| 4 | Electrochemical cells and EMF (Nernst equation) | Electrochemistry | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 5 | General properties of d-block elements | Transition and Inner Transition Elements | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 6 | Preparation of aldehydes and ketones | Aldehydes, Ketones and Carboxylic Acids | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 7 | Preparation of important polymers | Introduction to Polymer Chemistry | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 8 | Preparation and properties of phenols | Alcohols, Phenols and Ethers | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 9 | pH, Ka, Kb and buffer solutions | Ionic Equilibria | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| 10 | Integrated rate equations (zero and first order) | Chemical Kinetics | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
Chapter-wise important topics
Solid State · Physical Chemistry
| Density of a unit cell (calculations) asked 8× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Unit cells and packing efficiency asked 7× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Defects in solids and properties asked 6× | Board 2022Board 2023Board 2025Board 2026 | ★☆☆☆☆ |
| Types of solids and crystal lattices asked 4× | Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
Solutions · Physical Chemistry
| Raoult's law and vapour pressure asked 8× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Colligative properties asked 7× | Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Molar mass determination and van't Hoff factor asked 7× | Board 2022Board 2023Board 2024Board 2026 | ★★☆☆☆ |
| Types of solutions and concentration terms asked 2× | Board 2022Board 2026 | ★☆☆☆☆ |
Ionic Equilibria · Physical Chemistry
| pH, Ka, Kb and buffer solutions asked 11× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Ostwald's dilution law and degree of dissociation asked 6× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Solubility product and common-ion effect asked 4× | Board 2023Board 2025Board 2026 | ★☆☆☆☆ |
| Acids, bases and ionisation asked 1× | Board 2024 | ★☆☆☆☆ |
Chemical Thermodynamics · Physical Chemistry
| First law and enthalpy changes asked 21× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★★★ |
| Hess's law and enthalpy of reactions asked 5× | Board 2022Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Entropy and spontaneity asked 3× | Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Gibbs free energy asked 3× | Board 2023Board 2025Board 2026 | ★☆☆☆☆ |
Electrochemistry · Physical Chemistry
| Electrochemical cells and EMF (Nernst equation) asked 14× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Conductance and molar conductivity asked 5× | Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Electrolysis and Faraday's laws asked 5× | Board 2022Board 2024Board 2025 | ★☆☆☆☆ |
| Kohlrausch's law asked 1× | Board 2026 | ★☆☆☆☆ |
Chemical Kinetics · Physical Chemistry
| Integrated rate equations (zero and first order) asked 11× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Order and molecularity asked 8× | Board 2022Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Rate of reaction and rate law asked 3× | Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Collision theory and Arrhenius equation asked 1× | Board 2026 | ★☆☆☆☆ |
Elements of Groups 16, 17 and 18 · Inorganic Chemistry
| Trends in group 16, 17, 18 asked 8× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Oxides and oxoacids asked 5× | Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Interhalogen and noble-gas compounds asked 4× | Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Preparation and properties of compounds asked 4× | Board 2022Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
Transition and Inner Transition Elements · Inorganic Chemistry
| General properties of d-block elements asked 14× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Lanthanoids and actinoids asked 8× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Variable oxidation states and colour asked 6× | Board 2022Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Preparation of KMnO4 and K2Cr2O7 asked 2× | Board 2024Board 2025 | ★☆☆☆☆ |
Coordination Compounds · Inorganic Chemistry
| Werner's theory and terminology asked 15× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| Valence bond and crystal field theory asked 6× | Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| IUPAC nomenclature asked 6× | Board 2022Board 2023Board 2024Board 2025 | ★☆☆☆☆ |
| Isomerism in coordination compounds asked 5× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
Halogen Derivatives · Organic Chemistry
| Preparation and properties of haloalkanes/haloarenes asked 18× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★★☆ |
| Nucleophilic substitution (SN1, SN2) asked 3× | Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Classification and nomenclature asked 3× | Board 2023Board 2024 | ★☆☆☆☆ |
| Optical isomerism asked 2× | Board 2024Board 2026 | ★☆☆☆☆ |
Alcohols, Phenols and Ethers · Organic Chemistry
| Preparation and properties of phenols asked 11× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Preparation and properties of alcohols asked 6× | Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Preparation and properties of ethers asked 3× | Board 2022Board 2025Board 2026 | ★☆☆☆☆ |
Aldehydes, Ketones and Carboxylic Acids · Organic Chemistry
| Preparation of aldehydes and ketones asked 13× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Aldol and Cannizzaro reactions asked 7× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Preparation and properties of carboxylic acids asked 5× | Board 2023Board 2025Board 2026 | ★☆☆☆☆ |
| Nucleophilic addition reactions asked 4× | Board 2022Board 2023Board 2024Board 2026 | ★☆☆☆☆ |
Amines · Organic Chemistry
| Classification and preparation of amines asked 9× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Reactions of amines asked 6× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Basic character of amines asked 2× | Board 2024Board 2026 | ★☆☆☆☆ |
Biomolecules · Organic Chemistry
| Carbohydrates and their classification asked 9× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Proteins and structure asked 7× | Board 2022Board 2024Board 2025Board 2026 | ★★☆☆☆ |
Introduction to Polymer Chemistry · Organic Chemistry
| Preparation of important polymers asked 12× | Board 2023Board 2024Board 2025Board 2026 | ★★★☆☆ |
| Classification of polymers asked 4× | Board 2022Board 2025Board 2026 | ★☆☆☆☆ |
| Biodegradable polymers asked 1× | Board 2022 | ★☆☆☆☆ |
Green Chemistry and Nanochemistry · Organic Chemistry
| Principles of green chemistry asked 8× | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| Properties and applications of nanomaterials asked 4× | Board 2022Board 2024Board 2026 | ★☆☆☆☆ |
| Introduction to nanochemistry asked 4× | Board 2023Board 2024Board 2025Board 2026 | ★☆☆☆☆ |
| Green chemistry in day-to-day life asked 1× | Board 2025 | ★☆☆☆☆ |
Importance = how often a topic was asked × how recent, with extra weight for the latest official sample paper.