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CBSE Class 10 Science Question 16 of 28

Chemical Reactions and Equations — Question 16

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Question

Question 16

Explain the following in terms of gain or loss of oxygen with two examples each.

(a) Oxidation

(b) Reduction

Answer

(a) Oxidation is gain of oxygen by a substance.

For example,

  1. Copper is oxidised to Copper oxide:
    2Cu + O2 →Heat\xrightarrow{\text{Heat}} 2CuO

  2. Carbon is oxidised to Carbon dioxide
    C + O2 ⟶ CO2

(b) Reduction is loss of oxygen from a substance.

For example,

  1. Copper (II) oxide is reduced to Copper
    CuO + H2 →Heat\xrightarrow{\text{Heat}} Cu + H2O

  2. Zinc (II) oxide is reduced to Zinc.
    ZnO + C ⟶ Zn + CO