Copper becomes green when exposed to moist air for a long period. This is due to
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a
The formation of a layer of basic carbonate of copper on the surface of copper.
b
The formation of basic copper sulphate layer on the surface of the metal
c
The formation of a layer of cupric hydroxide on the surface of copper.
d
The formation of a layer of cupric oxide on the surface of copper
answer is A.
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Detailed Solution
copper becomes green when exposed to moist air for a long period of time because of the formation of a layer of basic carbonate of copper on the surface of copper.