This handbook collects the essential formulas, key facts, and classifications from every chapter of the Class 11 Chemistry NCERT syllabus (2026-27, NCF-SE rationalised edition) in one place. This handbook is a living document — more chapters will be appended here as they are published, so bookmark this page and check back as you progress through the syllabus. This Class 11 Chemistry formulas handbook is a handy quick-revision tool alongside the chapter-wise notes and important questions.
Chapter 1: Some Basic Concepts of Chemistry
- 1 mole=6.022×10²³ particles (Avogadro).
- Molarity=mol solute/L solution.
Related NCERT Content for Class 11 Chemistry Chapter 1
- NCERT Solutions for Some Basic Concepts of Chemistry
- Extra Questions (HOTS) for Some Basic Concepts of Chemistry
- Revision Notes for Some Basic Concepts of Chemistry
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 2: Structure of Atom
- Quantum numbers: n, l, ml, ms.
- Aufbau, Pauli, Hund’s rule.
- de Broglie: λ=h/mv; Heisenberg: Δx·Δp≥h/4π.
Related NCERT Content for Class 11 Chemistry Chapter 2
- NCERT Solutions for Structure of Atom
- Extra Questions (HOTS) for Structure of Atom
- Revision Notes for Structure of Atom
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 3: Classification of Elements and Periodicity in Properties
- Atomic radius: decreases across period, increases down group.
- Ionization enthalpy: increases across period, decreases down group.
Related NCERT Content for Class 11 Chemistry Chapter 3
- NCERT Solutions for Classification of Elements and Periodicity in Properties
- Extra Questions (HOTS) for Classification of Elements and Periodicity in Properties
- Revision Notes for Classification of Elements and Periodicity in Properties
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 4: Chemical Bonding and Molecular Structure
- VSEPR predicts shape; sp/sp²/sp³ hybridization.
- Bond order=½(bonding−antibonding electrons).
Related NCERT Content for Class 11 Chemistry Chapter 4
- NCERT Solutions for Chemical Bonding and Molecular Structure
- Extra Questions (HOTS) for Chemical Bonding and Molecular Structure
- Revision Notes for Chemical Bonding and Molecular Structure
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 5: Chemical Thermodynamics
- ΔU=q+w; H=U+PV.
- ΔG=ΔH−TΔS; ΔG<0 spontaneous.
Related NCERT Content for Class 11 Chemistry Chapter 5
- NCERT Solutions for Chemical Thermodynamics
- Extra Questions (HOTS) for Chemical Thermodynamics
- Revision Notes for Chemical Thermodynamics
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 6: Equilibrium
- Kc=[products]/[reactants].
- pH=−log[H⁺]; Kw=10−14 at 25°C.
Related NCERT Content for Class 11 Chemistry Chapter 6
- NCERT Solutions for Equilibrium
- Extra Questions (HOTS) for Equilibrium
- Revision Notes for Equilibrium
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 7: Redox Reactions
- Oxidation: loss of e⁻. Reduction: gain of e⁻.
- Balancing: oxidation number method / ion-electron method.
Related NCERT Content for Class 11 Chemistry Chapter 7
- NCERT Solutions for Redox Reactions
- Extra Questions (HOTS) for Redox Reactions
- Revision Notes for Redox Reactions
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 8: Organic Chemistry – Some Basic Principles and Techniques
- IUPAC nomenclature; structural isomerism.
- Inductive, resonance effects; hyperconjugation.
Related NCERT Content for Class 11 Chemistry Chapter 8
- NCERT Solutions for Organic Chemistry – Some Basic Principles and Techniques
- Extra Questions (HOTS) for Organic Chemistry – Some Basic Principles and Techniques
- Revision Notes for Organic Chemistry – Some Basic Principles and Techniques
- Class 11 Chemistry NCERT Book (Download PDF)
Chapter 9: Hydrocarbons
- Alkanes CnH2n+2; Alkenes CnH2n; Alkynes CnH2n−2.
- Markovnikov’s rule; arenes undergo electrophilic substitution.
Related NCERT Content for Class 11 Chemistry Chapter 9
- NCERT Solutions for Hydrocarbons
- Extra Questions (HOTS) for Hydrocarbons
- Revision Notes for Hydrocarbons
- Class 11 Chemistry NCERT Book (Download PDF)
