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

Correct Answer is: (D) CuCO3.Cu(OH)2

Cu+ H2O + CO2 → CuCO3.Cu(OH)2.

Green crust of basic copper carbonate is formed.