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When copper is exposed to air for longer duration then copper becomes green that is due to -

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Formation of a layer of cupric oxide on the surface of copper

Formation of a layer of basic carbonate on the surface of copper

Formation of a layer of cupric hydroxide on the surface of copper

answer is B.

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Detailed Solution

When a copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide.

Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.

Reaction:-

2 Cu + H₂O + CO₂ + O₂ → Cu(OH)₂ + CuCO₃

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