Question

When copper is placed in the atmosphere for sufficient time, a green crust is formed on its surface. The composition of the green crust is :

• A. Cu(OH)2
• B. CuO
• C. CuCO3
• D. CuCO3.Cu(OH)2

Answer 1

Answer: (D)

CuCO3.Cu(OH)2

Answer 2

Cu+ H2O + CO2 $\longrightarrow$ CuCO3.Cu(OH)2.

Green crust of basic copper carbonate is formed.