Question: Copper becomes green when exposed to moist air for a long period. This is due to :-
the formation of a layer of cupric oxide on the surface of copper.
the formation of basic copper sulphate layer on the surface of the metal
the formation of a layer of cupric hydroxide on the surface of copper.
the formation of a layer of basic carbonate of copper on the surface of copper.
Correct Option: , 4
Solution:
Solution Not Required
