Answers

2016-04-22T14:17:43+05:30
Copper vessels get tarnished due to copper oxide layer formed on its surface. Copper oxide is basic whereas lemon is acidic in nature. Lemon contains citric acid . So ,  when we rub copper vessel with lemon, the copper salts formed on the surface of vessel (i.e the layer of oxide), sulphides will be removed..

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2016-04-22T14:22:04+05:30
Copper vessels get corroded due to formationof copper oxide layer
Copper oxide is basic whereas lemon is acidic in nature. 
when we rub copper vessel with lemon, the copper salts formed on the surface of vessel will be removed..
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