(A) When $Copper$ $(Cu)$ is exposed to moist air containing $CO_2$,it reacts to form a green layer of basic copper carbonate,which is a mixture of $Cu

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(A) When $Copper$ $(Cu)$ is exposed to moist air containing $CO_2$,it reacts to form a green layer of basic copper carbonate,which is a mixture of $CuCO_3$ and $Cu(OH)_2$. The chemical reaction is: $2Cu + H_2O + CO_2 + \frac{1}{2}O_2 \to CuCO_3 \cdot Cu(OH)_2$ Therefore,the correct option is $(A)$.