Question

which type of coating we used to see when copper metal is exposed to moist air ?​

Answer 1

Explanation:

When 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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Answer 2

Answer:

greenish coloured coating we used to see when copper metal is exposed to moist air