(a) Explain the following in terms of gain or loss of oxygen with one example each :

(i) oxidation (ii) reduction

(b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

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Solution

(a)
(i) Oxidation: A chemical reaction in which a substance gains oxygen is called oxidation.

Example:

(ii) Reduction: A chemical reaction in which a substance loses oxygen is called reduction.

$Z n O + C ⟶ Z n + C O$ ( ZnO is reduced to Zn.)

$C u O + H_{2} ⟶ C u + H_{2} O$ , (CuO is reduced to Cu.)

(b)
Balanced chemical equation is:

$2 C u + O_{2} ⟶ 2 C u O$

(i) Copper is oxidised to copper oxide.It means addition of oxygen.
(ii) Oxygen is reduced to copper oxide. It means addition of metal i.e reduction.

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(a) Explain the following in terms of gain or loss of oxygen with one example each : (i) oxidation (ii) reduction (b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

(a) Explain the following in terms of gain or loss of oxygen with one example each :

(i) oxidation (ii) reduction

(b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.