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Types of Chemical Reaction — Syllabus

Tamil Nadu Board · Class 10 · Science

What Types of Chemical Reaction covers in Tamil Nadu Board Class 10 Science: 4 topics, for the 2026-27 session.

45 questions35 flashcards3 formulas & key relations5 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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4 Topics · Tamil Nadu Board Class 10 Science · 2026-27

Topics in Types of Chemical Reaction

1

Chemical Reactions – Basics

  • A chemical reaction involves breaking of old bonds and formation of new bonds.
  • Bond breaking absorbs energy; bond formation releases energy.
  • A chemical equation must be balanced — the number of atoms of each element must be equal on both sides (Law of Conservation of Matter).
2

Types of Chemical Reactions – Classification by Atom Rearrangement

  • There are 5 main types: Combination, Decomposition, Single Displacement, Double Displacement, and Combustion.
  • COMBINATION: Two or more reactants combine to form one product. A + B → AB. Also called synthesis or composition reaction. Most are EXOTHERMIC.
  • 3 Sub-types of Combination: (i) Element + Element → Compound (e.g., S + O₂ → SO₂), (ii) Compound + Element → Compound (e.g., PCl₃ + Cl₂ → PCl₅), (iii) Compound + Compound → Compound (e.g., SiO₂ + CaO
3

Reversible and Irreversible Reactions

  • Based on the DIRECTION of reaction, chemical reactions are classified as reversible and irreversible.
  • REVERSIBLE REACTION: Products can be converted back to reactants under suitable conditions. Represented by a double arrow ⇌.
  • Example: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) — PCl₅ decomposes and reforms continuously.
4

Rate of Chemical Reaction and Factors Affecting It

  • Rate of reaction = change in concentration (or amount) of reactants or products per unit time.
  • Formula: Rate = -d[A]/dt = +d[B]/dt for reaction A → B.
  • The negative sign indicates decrease in reactant concentration; positive sign indicates increase in product concentration.

Key Concepts

A reaction in which twoA single compound breaks down intoA reaction between an elementA reaction between two compounds whereA reaction where a substance rapidly

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Frequently Asked Questions

What are the important topics in Types of Chemical Reaction for Tamil Nadu Board Class 10 Science?
Key topics in Types of Chemical Reaction include Chemical Reactions – Basics, Types of Chemical Reactions – Classification by Atom Rearrangement, Reversible and Irreversible Reactions, Rate of Chemical Reaction and Factors Affecting It. Study these first, then practise questions on each for the Tamil Nadu Board Class 10 board exam.
How should I revise Types of Chemical Reaction for the Tamil Nadu Board Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Types of Chemical Reaction. 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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