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Syllabus

Chemical Reaction and Equations — Syllabus

NIOS · Class 10 · Science & Tech

What Chemical Reaction and Equations covers in NIOS Class 10 Science & Tech: 4 topics, for the 2026-27 session.

45 questions36 flashcards10 formulas & key relations5 concepts

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A comparison diagram illustrating the differences between physical changes (e.g., melting ice, boiling water, tearing paper) where no new substance is formed, and chemical changes (e.g., burning wood,
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4 Topics · NIOS Class 10 Science & Tech · 2026-27

Topics in Chemical Reaction and Equations

1

1. Chemical Changes and Chemical Equations

  • Physical changes are temporary and the substance returns to its original form.
  • Chemical changes are permanent and cannot be reversed to the original substance.
  • In a chemical equation, reactants are written on the left and products on the right.
2

2. Balancing Equations and Important Conditions

  • The Hit and Trial method is used for balancing equations.
  • Start with the compound containing the maximum number of atoms.
  • Balance one element at a time.
3

3. Mole, Mass, and Volume Relations

  • 6.022 x 10^23 molecules of any substance constitute one mole.
  • A balanced equation shows the mole ratio of reactants and products.
  • For gases, the volume ratio follows the coefficients when temperature and pressure are the same.
4

4. Types of Chemical Reactions

  • The main types are combination, decomposition, displacement, and double displacement reactions.
  • A combination reaction forms one product from two or more reactants.
  • A decomposition reaction breaks one compound into two or more substances.

Key Concepts

Central concept: Chemical change represented through balanced equations and classified reaction types

Physical and chemical changesChemical equationsBalanced chemical equationsQuantitative meaning of equationsTypes of chemical reactionsCombination reactionDecomposition reactionDisplacement reaction

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Frequently Asked Questions

What are the important topics in Chemical Reaction and Equations for NIOS Class 10 Science & Tech?
Key topics in Chemical Reaction and Equations include Chemical Changes and Chemical Equations, Balancing Equations and Important Conditions, Mole, Mass, and Volume Relations, Types of Chemical Reactions. Study these first, then practise questions on each for the NIOS Class 10 board exam.
How should I revise Chemical Reaction and Equations for the NIOS Class 10 board exam?
Learn the core ideas first, then work through the 45 practice questions on Chemical Reaction 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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