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copper vessels get a green coat when exposed to air in rainy season

Copper metal when exposed to air turns green in colour due to corrosion. Thus, when copper vessels are exposed to air in rainy season for sometime, the metal reacts with gases and moisture present in air to form a mixture of copper carbonate and copper hydroxide [(CuCO3). Cu(OH)2]. This gives a green colour to the vessels.  

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because of corrosion of copper. when its comes in contact with air it gets corroded and from a layer of COOPER CARBONATE. (CuCO3.(CuOH)2.

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 well i would like to clear out what gurleen has said:----Copper develops a strongly adhering oxide layer, which 

thickens to acquire the familiar green patina we see on 
copper vessel. In the presence of atmospheric sulfur dioxide 
(SO2
) the transition from oxide layer to patina is accelerated
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