Identify the substances that are oxidised and the substances that are reduced in the following reactions :
`CuO(s)+H_(2)(g)toCu(s)+H_(2)O(l)`

Explanation

`underset("Copper oxide")(CuO(s))+underset("Hydrogen")(H_(2)(g))tounderset("Copper")(Cu(s))+underset("Water")(H_(2)O(l))`
In this reaction, CuO is reduced because it loses oxygen. `H_(2)` is oxidised because it combines with the oxygen of CuO to form water.