Identify the substances that are oxidised and the substances which are reduced in the following reactions.
(i) 4Na(s) + O2(g) → 2Na2O(s)
(ii) CuO (s) + H2(g) → Cu (s) + H2O(l)
(a) $4Na (s) + O_2 (g) → 2Na_2O (s)$ : In the given equation, Sodium (Na) is oxidised as it gains oxygen and oxygen gets reduced.
(b) $CuO (s) + H_2 (g) → Cu (s) + H_2O (l)$ : In the given equation, Copper oxide (CuO) is reduced to copper (Cu) while hydrogen (H2) gets oxidised to water (H2O).
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