On long exposure to moist air, a copper vessel lose its lustre and acquire a coating of basic copper carbonate which is ( colour ) ?

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Q. Assertion :You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Reason: Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. Tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its charateristic lustre.

When copper vessels are exposed to moist air for a long time, a green coating is formed. Which are the constituents of the coating?
(i) Copper hydroxide
(ii) Copper carbonate
(iii) Copper oxide

Q. Assertion [A]: Copper becomes dull in moist air.
Reason [R]: Copper is coated by a thin film of its basic copper carbonate formed in moist air.

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