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  2. Justify that the following reactions are redox reaction CuO(s) +H2(g)---> Cu(s) +H2O(g)
# NCERT

8.3 Justify that the following reactions are redox reaction

(a) CuO_{(s)}+H_{2}_{(g)}\rightarrow Cu_{(s)}+ H_{2}O_{(g)}

Answers (1)
G Gautam harsolia

Solution-

Let us write the O.N of each element

\overset{\:\:2+\:\:-2}{CuO}\:+\:\overset{0}{H_{2}}\rightarrow \overset{0}{Cu}\:+ \:\overset{+1\:-2}{H_{2}O}

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

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