Question 3:

Identify the substances that are oxidised and the substances that are reduced in the

following reactions.

(i) 4Na_(s) + O_2(g) → 2Na₂O_(s)

(ii) CuO_(s) + H_2(g) → Cu_(s) + H₂O_(l)

Answer:

(i) Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced.

(ii) Copper oxide (CuO) is reduced to copper (Cu) while hydrogen (H₂) gets oxidised

     to water (H₂O).

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