Question

17.Justify the following reaction is a redox reactionCU(s) + H 2O(g)

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Answer 1

Explanation:

it is not a example of reduction reaction

Answer 2

Answer

(a) CuO(s) + H2(g) → Cu(s) + H2O(g)

Let us write the oxidation number of each element involved in the given reaction as:

+2 -2 0 0 +1 -2

Cu O(s) + H2(g) → Cu(s) + H2 O(g)

Here, the oxidation number of Cu decreases from +2 in CuO to 0 in Cu i.e., CuO is reduced to Cu. Also, the oxidation number of H increases from 0 in H2 to +1 in H2O i.e., H2 is oxidized to H2O. Hence, this reaction is a redox reaction.