Chemistry NEET 2021: Most Important Chapters [Chapter Wise Weightage]

neet chemistry important chapters chapter wise weightage

If you want to score good marks in the chemistry section of NEET 2021, it is necessary to know what chapters are important for the exam and to know what weightage each chapter carries.

As soon as you know which chapters are important, you can dedicate more time to them.

Do or die chapters in physics indicate which chapters need more concentration to be studied and, therefore, hold more weight in the NEET examination.

For those seeking admission to MBBS and BDS, the NTA is responsible for organizing the NEET UG exam. The NTA will also set the pattern for NEET. In order to understand the structure of the NEET exam paper, it is advisable for candidates to go through the exam pattern completely.

Most Important Chapters in NEET Chemistry [Class 11]:

The following table summarizes the questions that appeared in the chemistry part in each of the 16 AIPMT/NEET exams completed between 2008 and 2020.

In this way, you will be able to get an idea of the pattern of questions that have been asked from various topics. It is crucial to have knowledge of important topics in chemistry as this will strengthen the preparation for the test.

Chapter 1: Some Basic Concepts of Chemistry

Topic NameNumber of questions
Concentration based problem11
Moles, atoms and electrons10
Equation based problem6
Limiting reagent2
Emperical/molecular formula1
Total number of questions30

Chapter 2: Structure of Atom

Topic NameNumber of questions
AUFBAU Principle12
Quantum numbers9
Shell/subshell5
Bohr’s theory3
Heisenberg uncertainty principle3
Planck’s theory3
Nodal plane2
de Broglie equation1
Hydrogen spectra1
Number of E/P/N1
Total number of questions40

Chapter 3: Classification of Elements and Periodicity in Properties

Topic NameNumber of Questions
Atomic size8
Ionisation enthalpy (IE)8
Nature of compound 5
Stability of compound5
Electron affinity (EA)3
Electronic configuration3
Modern periodic table and periodicity3
Electronegativity1
Total number of questions36

Chapter 4: Chemical Bonding and Molecular Structure

Topic NameNumber of Questions
Hybridisation31
M.O.T19
Polarity8
V.S.E.P.R8
Types of bonding7
Acid, base and Fajan’s rule6
Octate and isoelectronics6
Covalent bonding3
Vander Waal force and hydrogen bonding2
Lattice/Hydration energy1
Total number of questions90

Chapter 5: States of Matter

Topic NameNumber of Questions
Kinetic theory of gas 6
Gas law3
Graham’s law3
Ideal gas law3
Compressibility factor2
Dalton’s law2
Vander Wall correction1
Total number of questions20

Chapter 6: Thermodynamics

Topic NameNumber of Questions
Gibbs energy change16
Thermochemistry8
Enthalpy and Internal energy6
Spontaneity and Entropy5
2nd Law and work done3
First Law of Thermodynamics2
Thermodynamics’ properties and process2
Extensive and Intensive Properties1
Hess’s Law1
Total number of questions44

Chapter 7: Equilibrium

Topic NameNumber of Questions
Kp, Kc – amd Factors Affecting them16
Acids & Bases – Definitions and Classification12
pH Calculation10
Solubility Product9
Buffer8
Introduction to Equilibrium4
Common Ion Effect2
Ki for Acid, Base and Salt2
Le for Acid, Base and Salt2
Salt Hydrolysis2
Total number of questions67

Chapter 8: Redox Reactions

Topic NameNumber of Questions
Oxidation and Reducing Agents (Oxidation Number)13
EMF -Electromotive force and Electrode potential2
Introduction to Redox2
Balancing an Equation1
Equivalent Weight and Normality1
Total number of questions19


Chapter 9: Hydrogen

Topic NameNumber of Questions
H2O2 (Hydrogen Peroxide)3
Hard and Soft Water3
Preparation and Properties1
Total number of questions7

Chapter 10: The s-Block Elements

Topic NameNumber of Questions
Chemical Properties10
Some Important Compounds of Ca and Na5
Reasoning4
Biological Importance of Na, Mg, Ca and other elements2
Physical Properties2
Total number of questions23

Chapter 11: The p-Block Elements

Topic NameNumber of Questions
Carbon Family – Chemical and Physical Properties7
Boron Family – Chemical and Physical Properties5
Compounds of Silicon, Structure of Silicon Dioxide3
Allotropes of Carbon, Structure of Diamond and Graphite1
Compounds of Boron, Structure and Reactions of Diborane/Boric Acid1
Total number of questions17

Chapter 12: Organic Chemistry – Some Basic Principles and Techniques

Topic NameNumber of Questions
Nomenclature11
Nucleophile and Electrophile11
Electron Displacement Effects10
Reaction Intermediates and their Stability8
Stereo Isomer8
Acidic and Basic Character7
Shape, Hybridisation and Structure of Carbon Compounds4
Structural Isomer4
Conformational Isomers3
Purificatioon of Organic Compounds, Chromatography and Distillation2
Qualitative Analysis of Organic Compounds2
Quantitative Analysis of Organic Compounds2
SN, Addition and Elimination Reactions2
Total number of questions74

Chapter 13: Hydrocarbons

Topic NameNumber of Questions
Alkanes, Alkenes and Alkynes -Chemical Properties21
Alkanes, Alkenes and Alkynes – Nomenclature, Isomerism and Mechanism11
Alkanes, Alkenes and Alkynes – Methods of preparation6
Aromatic Hydrocarbons – Bnezene – Structure, Preparation and Chemical Reactions6
Aromatic Hydrocarbons – Mechanism2
Alkanes, Alkenes and Alkynes – Conformations and Hybridisation1
Total number of questions47

Chapter 14: Environmental Chemistry

Topic NameNumber of Questions
Air Pollution – Greenhouse Effect2
Air Pollution – Smog2
Air Pollution – Gaseous Pollutants – Oxides of C and N1
Water Pollution – Biological Oxygen Demand1
Total number of questions6

Most Important Chapters in NEET Chemistry [Class 12]:

Chapter 1: The Solid State

Topic NameNumber of Questions
Density/Formula/Packing Fraction12
Voids and radius ratio/coordination number8
Introduction and Type of Crystal System5
Imperfections in Solids4
Total number of questions29

Chapter 2: Solutions

Topic NameNumber of Questions
Depression of Freezing point8
Introduction/ Colligative properties6
Elevation of Boiling point3
Raoult’s Law3
Relative Lowering of Vapour Pressure/ Vapour Pressure3
Van’t Hoff Factor3
Osmosis and Osmotic Pressure2
Azeotrope1
Concentration Term and Henry’s Law1
Dalton’s Law of Partial Pressure/Henry’s Law1
Total number of questions31

Chapter 3: Electrochemistry

Topic NameNumber of Questions
Faraday’s Law of Electrolysis9
Electrode Potential/ Introduction7
Relation between Cell Potential and Gibbs Energy and Kc/pH7
Kohlrausch’s Law/ Cell Constant6
Electrolytic Cell/ Electrochemical Cell/ Galvanic Cell4
Nernst Equation4
Specific and Molar Conductance/ Conductivity3
Electrochemical series1
Hydrogen Economy1
Total number of questions42

Chapter 4: Chemical Kinetics

Topic NameNumber of Questions
Definition, Rate Constant, Rate Law22
First Order Reaction Kinetics10
Arrhenius Concept9
Order, Molecularity and Mechanism7
Catalyst1
Total number of questions49

Chapter 5: Surface Chemistry

Topic NameNumber of Questions
Colloidal Solution8
Adsorption Isotherm4
Adsorption and Absorption3
Catalyst3
Total number of questions18

Chapter 6: General Principles and Processes of Isolation of Elements

Topic NameNumber of Questions
Intro – Flux, Leaching, Roasting and Calcination9
Metallurgy of Individual elements3
Refining Process2
Ellingham Diagram1
Total number of questions15

Chapter 7: The p-Block Elements

Topic NameNumber of Questions
group 15, preparation and properties15
group 16, preparation and properties10
group 17, preparation and properties11
group 18, preparation and properties1
Interhalogen Compounds3
Total number of questions40

Chapter 8: The d & f Block Elements

Topic NameNumber of Questions
d-block Elements, Physical and Chemical properties27
Chemistry of KMnO4, K2Cr2O7 and CrO5 and others7
f-block elements, physical and chemical properties4
Lanthanoid/Actinoid contraction4
Total number of questions42

Chapter 9: Coordination Compounds

Topic NameNumber of Questions
VBT and CFT, Limitation/Hybridisation34
Isomerism in coordination compounds13
Coordination compounds, introduction and classification/nomenclature7
Ligands4
Organometallic complex and their uses3
Werner’s theory2
Total number of questions63

Chapter 10: Haloalkanes and Haloarenes

Topic NameNumber of Questions
Mechanism of reaction11
Chemical properties3
Isomerism and chirality1
Total number of questions15

Chapter 11: Alcohols, Phenols, and Ethers

Topic NameNumber of Questions
Alcohols: preparation, physical and chemical properties17
Ethers: preparation, physical and chemical properties, uses10
Phenols: preparation, properties, acidic nature of phenol6
Mechanism of dehydration, uses, methanol and ethanol4
Total number of questions37

Chapter 12: Aldehydes, Ketones, and Carboxylic Acids

Topic NameNumber of Questions
Mechanism and isomers14
Preparation and properties of aldehydes and ketones13
Name reaction6
Acid derivatives, preparation and properties2
Carboxylic acids1
Hybridisation1
Total number of questions37

Chapter 13: Amines

Topic NameNumber of Questions
Amines: Introduction, preparation and properties16
Diazonium salts: Preparation, reactions, uses5
Urea and nitro compounds4
Identification of primary, secondary and tertiary amines2
Cyanides and isocyanides1
Total number of questions28

Chapter 14: Biomolecules

Topic NameNumber of Questions
Carbohydrates: Classification, D-L configuration11
Proteins: a amino acids, peptide bonds, proteins, structure of proteins9
Vitamins/hormones/enzymes9
Nucleic acids: DNA and RNA6
Denaturation of proteins and chemical properties1
Introduction1
Total number of questions37

Chapter 15: Polymers

Topic NameNumber of Questions
Classification – methods of polymerization, copolymerization15
Polymers: natural/synthetic, Biodegradable/non-biodegradable15
Total number of questions30

Chapter 16: Chemistry in Everyday Life

Topic NameNumber of Questions
Medicines – and other chemical uses in daily life14
Cleansing agents – soaps and detergents, cleansing action/Dyes/Propellant4
Food – Preservations, artificial sweetening agents, antioxidants2
Total number of questions20

Good luck Medicoholics! Until next time.

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