Question

-2) A copper vessel when exposed to moist air for long acquires a dull green
coating​

Answer 1

Answer:

When a copper vessel is exposed to moist air for long time acquires a dull green colour which is form due to the formation of basic carbonate due to its reaction with CO2 Present in the air. Explanation: ... Hence, the corrodedcoating of green color is coppercarbonate which is basic in nature.

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Answer 2

Answer:

Answer: 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.