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Question

The green coloured coating that develops on a copper rod when it is left in open for some days, is of .
  1. copper sulphate
  2. copper chloride
  3. copper hydride
  4. copper carbonate


Solution

The correct option is D 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 further reaction with carbon dioxide and water preset in air, and 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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