Copper substances when exposed to air gains a green coating due to the formation of:
A. CuO
B. CuCO3 Cu(OH)2
C. CuSO4
D. Cu(NO3)2
Answer: Option B
Solution (By Examveda Team)
When copper is exposed to air, it reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is basic copper carbonate (CuCO3. Cu (OH)2). The formation of this green coating on the surface of a copper object corrodes it.This Question Belongs to General Knowledge >> Chemistry
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