When copper vessel is left in the atmosphere, it reacts with oxygen present in the atmosphere and forms copper oxide, which gives a dull appearance. It is alkaline in nature so when rubbed with lemon. The acid present in the lemon neutralizes the effect of base. And it begins to shine again?
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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.
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