A copper vessel when exposed to moist air for a long time acquires a green coating. This green coating is a mixture of and .
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copper and carbon dioxide
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Explanation:
WHEN A COPPER OBJECT REMAINS IN DAMP SIR FOR A CONSIDERABLE TIME,THEN COPPER REACTS SLOWLY WITH THE CARBON DIOXIDE AND WATER VAPOURS OF AIR TO FORM A GREEN COATING OF BASIC COPPER CARBONATE ON THE SURFACE OF THE OBJECT.
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