If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
(A) CuSO 4
(B) CuCO 3
(C) Cu(NO 3 ) 2
Copper corrodes in the presence of air and moisture .
Because of the CO 2 and O 2 present in the air, Cu reacts with them to form CuCO 3 which is green in color.
The reactions take place as:
So, the correct answer is (b) CuCO 3