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CLASS 10 SCIENCE · CHEMICAL REACTIONS AND EQUATIONS

Types of chemical reactions and redox

Combination: A + B → AB. Decomposition: AB → A + B. Displacement: a more reactive element pushes out a less reactive one. Double displacement: ions are exchanged. Oxidation = gain of oxygen (or loss of hydrogen); reduction = loss of oxygen (or gain of hydrogen).

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Worked examples

Example 1 · level 1

What type of reaction is this? Zn + CuSO₄ → ZnSO₄ + Cu

  1. Decomposition
  2. Double displacement
  3. Displacement
  4. Combination
Show solution
  1. Zn + CuSO₄ → ZnSO₄ + Cu
  2. This is a displacement reaction.

Answer: Displacement

Example 2 · level 2

What type of reaction is this? 2AgCl → 2Ag + Cl₂ (in sunlight)

  1. Double displacement
  2. Combination
  3. Decomposition
  4. Displacement
Show solution
  1. 2AgCl → 2Ag + Cl₂ (in sunlight)
  2. This is a decomposition reaction.

Answer: Decomposition

Example 3 · level 3

In the reaction ZnO + C → Zn + CO, which substance is oxidised?

  1. CO
  2. Zn
  3. C
  4. ZnO
Show solution
  1. ZnO loses oxygen → reduced.
  2. C gains oxygen → oxidised.
  3. Answer: C.

Answer: C

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