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Chemical Reactions and Equations — Syllabus

Gujarat Board · Class 10 · Science

What Chemical Reactions and Equations covers in Gujarat Board Class 10 Science: 3 topics, for the 2026-27 session.

59 questions30 flashcards5 concepts

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An illustration showing common daily life situations where chemical reactions occur, such as milk turning sour, iron rusting, grapes fermenting, food cooking, food digestion, and respiration.
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3 Topics · Gujarat Board Class 10 Science · 2026-27

Topics in Chemical Reactions and Equations

1

Chemical Equations – Writing and Balancing

  • A chemical reaction is identified by: change in state, change in colour, evolution of a gas, or change in temperature.
  • A word equation shows reactants on the left-hand side (LHS) and products on the right-hand side (RHS), separated by an arrow (→).
  • A chemical equation uses chemical symbols and formulae instead of names of substances.
2

Types of Chemical Reactions

  • There are 5 main types of chemical reactions: Combination, Decomposition, Displacement, Double Displacement, and Oxidation-Reduction (Redox).
  • COMBINATION REACTION: Two or more reactants combine to form a single product. A + B → AB.
  • DECOMPOSITION REACTION: A single reactant breaks down into two or more products. AB → A + B. It is the opposite of combination.
3

Effects of Oxidation – Corrosion and Rancidity

  • Corrosion is the slow eating away of metals due to reaction with moisture, oxygen, or acids in the environment.
  • Rusting of iron is the most common example of corrosion: Iron + Water + Oxygen → Rust (hydrated iron oxide, Fe₂O₃·xH₂O).
  • Silver tarnishes to form a black coating (silver sulphide, Ag₂S); copper forms a green coating (copper carbonate/basic copper carbonate).

Key Concepts

A chemical reaction is a processA chemical equation is a symbolicBalancing a chemical equation means adjustingA combination reaction occurs when twoA decomposition reaction is the opposite

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Frequently Asked Questions

What are the important topics in Chemical Reactions and Equations for Gujarat Board Class 10 Science?
Key topics in Chemical Reactions and Equations include Chemical Equations – Writing and Balancing, Types of Chemical Reactions, Effects of Oxidation – Corrosion and Rancidity. Study these first, then practise questions on each for the Gujarat Board Class 10 board exam.
How should I revise Chemical Reactions and Equations for the Gujarat Board Class 10 board exam?
Learn the core ideas first, then work through the 59 practice questions on Chemical Reactions and Equations. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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