(a) In the following reactions, name the reactants, which undergo oxidation and reduction:
(i) `CuO(S)+H_(2)(g)rarrCu(S)+H_(2)O(g)`
(ii) CuO(S)+ZnO(S)+Cu(S)`
(b) State one industrial application of reduction.

Explanation

(a) (i) The reactants copper oxide and hydrogen. Copper oxide undergoes reduction and hydrogen `(H_(2))` undergoes oxidation.
(ii) The reactants are copper oxide and zinc . Zinc undergoes oxidation and copper oxide undergoes reduction.
(b) Calcium carbonate is reduced in industries to get `CaO and CO_(2)`.