Explain the following in terms of gain or loss of oxygen with two examples each. (a) Oxidation (b) Reduction
(a) (i) Oxidation: A chemical reaction in which a substance gains oxygen is called oxidation. Example:   (ii) Reduction: A chemical reaction in which a substance loses oxygen is called reduction. ZnO+C⟶Zn+CO( ZnO is reduced to Zn.) CuO+H2⟶Cu+H2O, (CuO is reduced to Cu.)
