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Q.

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.
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