Q.) The chemical reaction between copper and
oxygen can be categorized as :
(a) Displacement reaction
(b) Decomposition reaction
(c) Combination reaction
(d) Double displacement reaction
Ans. (c) Combination reaction
Explanation: When copper is heated, a black coloured coating is formed on its surface as copper reacts with oxygen to form copper (II) oxide. The chemical reaction taking place between copper and oxygen : 2Cu + O2 → 2CuO As copper and oxygen combine to form a single product, it is a combination reaction.