Question

Copper becomes green when exposed to moist air for longer period –
(a) because of the formation of a layer of cupric oxide on the surface of copper
(b) because of the formation of a layer of basic carbonate of copper on the surface of copper
(c) because of the formation of a layer of cupric hydroxide on the surface of copper
(d) because of the formation of a layer of cupric acetate on the surface of copper

Answer 1

Bi is the answer.Copper rects with carbon dioxide in the atmosphere to form basic copper carbonate

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