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Question

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

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 reacts with oxygen and forms copper oxide. The reaction occurs as follows:

2Cu (s)+O2 (g)2CuO (s)

This on reaction with carbon dioxide and water forms a greenish layer of basic copper carbonate. The reaction occurs as follows:

2CuO (s)+H2O(l)+CO2(g)CuCO3(s)+Cu(OH)2(s)

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