Question

what is the green coating on copper​

Answer 1

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.

Answer 2

Explanation:

When copper is exposed to air it forms copper carbonate

Copper carbonate is green in color and it is poisonous in nature

So to remove it tamarind or lime juice is used. Because it forms then corresponding salt and water by which copper carbonate gets removed

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