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Question

When copper is exposed to moist air for a long time then a layer deposits on its surface due to corrosion. The colour of this layer is:


A

Brown

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B

Green

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C

Black

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D

Grey

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Solution

The correct option is B

Green


When copper is exposed to moist air for a long time, it acquires a dull, green coating. The green material is a mixture of copper hydroxide Cu(OH)2 and copper carbonate CuCO3.

The following is the reaction
2Cu+H2O+CO2+O2CuCO3.Cu(OH)2


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