Copper objects lose their shine and form green coating of
(a) Copper oxide
(b) Copper hydroxide and Copper oxide
(c) Basic Copper carbonate
(d) Copper carbonate

Correct Answer: (c) Basic Copper carbonate

Explanation: The copper object loses its shine after some time is due to the formation of the copper oxide layer on them. When a copper object reacts with damp air, CO₂, and water. It forms a green coating of basic copper carbonate on the surface of the object.