Question

Green coating on a copper vessel which is exposed to air for a long time

Answer 1

Answer:

When copper vessel is exposed to air turns green in colour due to corrosion. It is so because the metal reacts with moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide, which gives a green colour to the surface of copper vessel.

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Answer 2

Answer:

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.

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