Question

69. When a copper vessel is exposed to moist
air for a long time, it acquires a dull green
coating on its surface. The material of this
green coating is a mixture of
SA) copper oxide and copper sulphate
(B) copper carbonate and
hydroxide
(C) copper oxide and copper carbonate
(D) copper hydroxide and copper sulphate
and copper​

Answer 1

Answer:

The answer is option (B)

Explanation:

Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to most air for a long time, 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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