Copper is very slowly oxidized on the surface in moist air, giving a green coating of verdigris is:

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${CuSO}_{4}^{}$

Cu₂O

CuCO₃

$Cu {({CH}_{3} COO)}_{2} \cdot Cu (OH)_{2}$

answer is C.

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Detailed Solution

Molecular formula of verdigris is $Cu {({CH}_{3} COO)}_{2} \cdot Cu (OH)_{2}$ and it is formed when Cu is exposed to the surrounding in the presence of acetic acid and moist air (consisting of carbon dioxide, water vapour and oxygen).

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