Copper becomes green when exposed to moist air for a long period. This is due to
- Athe formation of a layer of cupric oxide on the surface of copper.
- Bthe formation of a layer of basic carbonate of copper on the surface of copper.
- Cthe formation of a layer of cupric hydroxide on the surface of copper.
- Dthe formation of basic copper sulphate layer on the surface of the metal.
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