JEE Main 2014 Chemistry question

Copper becomes green when exposed to moist air for a long period. This is due to:

(1)the formation of a layer of cupric oxide on the surface of copper.
(2)the formation of a layer of basic carbonate of copper on the surface of copper.Correct
(3)the formation of a layer of cupric hydroxide on the surface of copper.
(4)the formation of basic copper sulphate layer on the surface of the metal.

Answer: (2)

Solution

In moist air containing carbon dioxide, copper slowly forms the green patina of basic copper carbonate, , option (2). Cupric

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Question ID VK-104576