Question

(b)When a copper surface is exposed to air for a long time, it develops a greenish layer on its surface.Why?

Answer 1

Answer:

copper react with moist air to form copper carbonate which is green in colour so a greenish layer is formed on the surface of copper.

Answer 2

Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.

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