Chemical Reactions and Equations

Class 10 Science • Chapter 2

Chapter Overview

This chapter explains chemical reactions, their observable characteristics, representation through chemical equations, balancing of equations and major types of chemical reactions. It also covers oxidation, reduction, redox reactions, corrosion and rancidity.

📘 Complete Notes

Detailed chapter notes covering concepts, definitions, reaction types, equations, oxidation-reduction, corrosion and rancidity.

❓ Important Questions

Exam-focused questions, reasoning problems, equation practice and competency-based questions.

📝 Previous Year Questions

Official CBSE previous-year paper resources and chapter-focused practice material.

Topics Covered

Chemical Reactions

Observations of Chemical Reactions

Chemical Equations

Balanced Chemical Equations

State Symbols

Combination Reactions

Decomposition Reactions

Displacement Reactions

Double Displacement Reactions

Precipitation Reactions

Exothermic Reactions

Endothermic Reactions

Oxidation

Reduction

Redox Reactions

Corrosion

Rancidity

Quick Revision

Chemical reaction → formation of one or more new substances.
Balanced equation → same number of atoms of each element on both sides.
Combination → two or more substances form one main product.
Decomposition → one compound breaks into simpler substances.
Displacement → more reactive element replaces a less reactive element.
Double displacement → ions are exchanged between compounds.
Oxidation and reduction together → redox reaction.
Corrosion → gradual deterioration of a metal.
Rancidity → oxidative spoilage of fats and oils.

Official Study Sources

Students should also refer to the official NCERT textbook and CBSE Academic resources for curriculum-aligned study.

NCERT Official Textbooks → CBSE Academic Curriculum 2026-27 → CBSE Assessment Resources →