1.

Identify the substance that are oxidised and the substances that are redured in the following reactions. (i) 4Na(S)+O_(2)(g)rarr2Na_(2)O(S) (ii) CuO(S)+H_(2)(g)rarrCu(S)+H_(2)O(l)

Answer»

SOLUTION :(i) Sodium is LOSING the electrons to oxygen, so it is oxidised. Oxygen is GAINING the electrons, so it is reduced.
(ii) `H_(2)`is oxidised into water.
CuO is reduced to Cu metal.


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