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Q. |
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» B. CuCO3 Cu(OH)2 | |
Explanation: 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. |
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