These NCERT Solutions for Class 11 Chemistry are free, and checked by our teachers. Made for 2026-27, they walk you through each step, so you're ready for your 2026 exams.
What Makes These Class 11 Chemistry Solutions Useful
- Step-by-step help: hard topics and tough questions are broken down clearly, so ideas are easy to follow.
- Marks in mind: these answers follow the official marking style, so you know how to write well in 2026.
- Full coverage: every question at the end of each chapter has a solved answer.
- Follows 2026-27 rules: every answer matches the current NCERT guidelines for Class 11 Chemistry.
Chapter-Wise Class 11 Chemistry Solutions PDF (2026-27)
Click the chapter links below to view or download the full NCERT solutions for Class 11 Chemistry. Pick any chapter to begin getting ready for your 2026 exams.
| Chapter 01 Some Basic Concepts of Chemistry NCERT Solutions |
| Chapter 03 Classification of Elements and Periodicity in Properties NCERT Solutions |
| Chapter 04 Chemical Bonding and Molecular Structure NCERT Solutions |
| Chapter 05 Thermodynamics NCERT Solutions |
| Chapter 06 Equilibrium NCERT Solutions |
| Chapter 07 Redox Reactions NCERT Solutions |
| Chapter 08 Organic Chemistry NCERT Solutions |
| Chapter 09 Hydrocarbons NCERT Solutions |
Free study material for Chemistry
Class 11 Chemistry - Marks Weightage (2026-27)
Official CBSE unit-wise weightage for the 70-mark theory paper, plus 30 marks for practical assessment. Source: CBSE Curriculum.
| Units - Chemistry Syllabus Units | Marks |
|---|---|
| Some Basic Concepts of Chemistry (Ch 1) | 12 |
| Classification of Elements & Periodicity (Ch 3) | 06 |
| Chemical Bonding and Molecular Structure (Ch 4) | 14 |
| Thermodynamics (Ch 5) | 15 |
| Units - Chemistry Syllabus Units | Marks |
|---|---|
| Equilibrium (Ch 6) | 12 |
| Redox Reactions (Ch 7) | 07 |
| Organic Chemistry & Hydrocarbons (Ch 8-9) | 24 |
| Theory Total | 70 |
Organic Chemistry and Hydrocarbons carry the highest combined unit weightage (24 marks).
Core Unit Periods - Class 11 Chemistry
Teaching periods as per the NCERT syllabus guidelines for structured study planning.
Preview a Solved Question From Each Chemistry Chapter
Expand to see a key conceptual problem and solution preview, or jump directly to the chapter section above.
Chapter 01 Some Basic Concepts of Chemistry
A mole is the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12. Molar mass of $NH_3 = 14 + (3 \times 1) = 17 \text{ g/mol}$. Number of moles $= 34 / 17 = 2 \text{ moles}$. Number of molecules $= 2 \times 6.022 \times 10^{23} = 1.204 \times 10^{24}$ molecules.
Jump to Chapter 1 section
Chapter 03 Classification of Elements and Periodicity in Properties
Electronegativity decreases down a group because atomic size increases as new shells are added, increasing the distance between the nucleus and the valence shell electrons, which reduces the effective nuclear pull.
Jump to Chapter 2 section
Chapter 04 Chemical Bonding and Molecular Structure
Hybridisation is the process of intermixing of atomic orbitals of slightly different energies to redistribute their energy and form new orbitals of equivalent energy. In $CH_4$, carbon undergoes $sp^3$ hybridisation, resulting in a tetrahedral geometry with a bond angle of $109.5^\circ$.
Jump to Chapter 3 section
Chapter 05 Thermodynamics
The First Law of Thermodynamics states that energy can neither be created nor destroyed, though it can be transformed from one form to another (Law of Conservation of Energy). Mathematical equation: $\Delta U = q + w$.
Jump to Chapter 4 section
Chapter 06 Equilibrium
Le Chatelier's Principle states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the equilibrium shifts in such a direction as to nullify or minimize the effect of that change.
Jump to Chapter 5 section
Chapter 07 Redox Reactions
Oxidation is defined as the loss of electrons by any atom, ion, or molecule.
Jump to Chapter 6 section
Chapter 08 Organic Chemistry – Some Basic Principles and Techniques
The inductive effect is the displacement of sigma ($\sigma$) electrons along a carbon chain due to the presence of an electronegative or electropositive group. It is a **permanent** electronic effect.
Jump to Chapter 7 section
Chapter 09 Hydrocarbons
Markovnikov's rule states that when an unsymmetrical reagent (like $HBr$) adds to an unsymmetrical alkene, the negative part of the reagent gets attached to that carbon atom which possesses the lesser number of hydrogen atoms.
Jump to Chapter 8 section
Unit 1 Some Basic Concepts of Chemistry
In this chapter the main key concepts you will be reading are Importance of Chemistry, Nature of Matter, Properties of Matter and their Measurement, Uncertainty in Measurement, Laws of Chemical Combinations, Dalton’s Atomic Theory, Atomic and Molecular Masses, Mole Concept and Molar Masses, Percentage Composition, Stoichiometry and Stoichiometric Calculations.
Unit 2 Structure of Atom
In this chapter the main key concepts you will be reading are Discovery of Sub-atomic Particles, Atomic Models, Developments Leading to the Bohr’s Model of Atom, Bohr’s Model for Hydrogen Atom, Towards Quantum Mechanical Model of the Atom, Quantum Mechanical Model of Atom.
Unit 3 Classification of Elements and Periodicity in Properties
In this chapter the main key concepts you will be reading are Why do we Need to Classify Elements? Genesis of Periodic Classification, Modern Periodic Law and the present form of the Periodic Table, Nomenclature of Elements with Atomic Numbers, Electronic Configurations of Elements and the Periodic Table, Electronic Configurations and Types of Elements: s-, p-, d-, f- Blocks, Periodic Trends in Properties of Elements.
Unit 4 Chemical Bonding and Molecular Structure
In this chapter the main key concepts you will be reading are Kössel-Lewis Approach to Chemical Bonding, Ionic or Electrovalent Bond, Bond Parameters, The Valence Shell Electron Pair Repulsion (VSEPR) Theory, Valence Bond Theory, Hybridisation, Molecular Orbital Theory, Bonding in Some Homo-nuclear Diatomic Molecules, Hydrogen Bonding
Unit 5 States of Matter
In this chapter the main key concepts you will be reading are Intermolecular Forces, Thermal Energy, Intermolecular Forces vs Thermal Interactions, The Gaseous State, the Gas Laws, Ideal Gas Equation, Kinetic Energy and Molecular Speeds, Kinetic Molecular Theory of Gases, Behaviour of Real Gases: Deviation from Ideal Gas Behaviour, Liquefaction of Gases, Liquid State.
Unit 6 Thermodynamics
In this chapter the main key concepts you will be reading are Thermodynamic Terms, Applications, Measurement of ∆U and ∆H: Calorimetry, Enthalpy Change, ∆rH of a Reaction – Reaction Enthalpy, Enthalpies for Different Types of Reactions, Spontaneity, Gibbs Energy Change and Equilibrium.
Unit 7 Equilibrium
In this chapter the main key concepts you will be reading are Equilibrium in Physical Processes, Equilibrium in Chemical Processes – Dynamic Equilibrium, Law of Chemical Equilibrium and Equilibrium Constant, Homogeneous Equilibria, Heterogeneous Equilibria, Applications of Equilibrium Constants, Relationship between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G, Factors Affecting Equilibria, Ionic Equilibrium in Solution, Acids, Bases and Salts, Ionization of Acids and Bases, Buffer Solutions, Solubility Equilibria of Sparingly Soluble Salts.
Unit 8 Redox Reactions
In this chapter the main key concepts you will be reading are Classical Idea of Redox Reactions-Oxidation and Reduction, Redox Reactions in Terms of Electron Transfer Reactions, Oxidation Number, Redox Reactions and Electrode Processes.
Unit 9 Hydrogen
In this chapter the main key concepts you will be reading are Position of Hydrogen in the Periodic Table, Dihydrogen, H2, Preparation of Dihydrogen, H2 Properties of Dihydrogen, Hydrides, Water, Hydrogen Peroxide (H2O2), Heavy Water, D2O, and Dihydrogen as a Fuel.
Unit 10 The s-Block Elements
In this chapter the main key concepts you will be reading are Group 1 Elements: Alkali Metals, General Characteristics of the Compounds of the Alkali Metals, Anomalous Properties of Lithium, Some Important Compounds of Sodium, Biological Importance of Sodium and Potassium. Group 2 Elements : Alkaline Earth Metals, General Characteristics of Compounds of the Alkaline Earth Metals, Anomalous Behaviour of Beryllium, Some Important Compounds of Calcium, Biological Importance of Magnesium and Calcium.
Unit 11 The p-Block Elements
In this chapter the main key concepts you will be reading are Group 13 Elements: The Boron Family, Important Trends and Anomalous Properties of Boron, Some Important Compounds of Boron, Uses of Boron and Aluminium and their Compounds, Group 14 Elements: The Carbon Family, Important Trends and Anomalous Behaviour of Carbon, Allotropes of Carbon, Some Important Compounds of Carbon and Silicon.
Unit 12 Organic Chemistry – Some Basic Principles and Techniques
In this chapter the main key concepts you will be reading are General Introduction, Tetra valence of Carbon: Shapes of Organic Compounds, Structural Representations of Organic Compounds, Classification of Organic Compounds, Nomenclature of Organic Compounds, Isomerism, and Fundamental Concepts in Organic Reaction Mechanism, Methods of Purification of Organic Compounds, Qualitative Analysis of Organic Compounds, and Quantitative Analysis
Unit 13 Hydrocarbons
In this chapter the main key concepts you will be reading are Classification, Alkynes, Aromatic Hydrocarbon, Carcinogenicity and Toxicity
Unit 14 Environmental Chemistry
In this chapter the main key concepts you will be reading are Environmental Pollution, Atmospheric Pollution, Water Pollution, Soil Pollution, Industrial Waste, Strategies to control Environmental Pollution, Green Chemistry.
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