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Question

What is the green colour coating that forms on copper when it is left exposed?

A
Copper sulphate
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B
Copper carbonate
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C
Copper chloride
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D
Copper hydride
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Solution

The correct option is B Copper carbonate
When exposed to the atmosphere, copper forms a layer of copper carbonate which has a green shade. This is responsible for the phenomenon of copper turning green when left in the open.

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