Question

The surface of copper vessels gets tarnished when exposed to humid air for long time

Answer 1

Because a layer of oxides got deposited on copper vessel which led into tarnishing
This layer can be removed by the action of lemon or any another acid
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Answer 2

heyaaa.....

heres ur ans....

The surface of copper vessels gets tarnished when exposed to humid air because copper reacts with moist carbon dioxide and gain a green coat. This green substance is copper carbonate...

hope this helps...