Answer:
In the presence of moist air, a
green layer of basic copper carbonate is deposited on the surface of the metal.
As a result, copper gets corroded.
\[2Cu+\underbrace{{{O}_{2}}+C{{O}_{2}}+{{H}_{2}}O}_{\text{(air}\,\text{
}\!\!\And\!\!\text{
}\,\text{moisture)}}\,\,\xrightarrow{\,}\,\,\underset{\text{(Green)}}{\mathop{CuC{{O}_{3}}\,Cu{{(OH)}_{2}}}}\,\]
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