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Copper substances when exposed to air gains a green coating due to the formation of:
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- CuO
- CuCO3 Cu(OH)2
- CuSO4
- Cu(NO3)2
- CuO
Correct Option: B
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.
