When Copper is exposed to moist air for a long time, it... – Chemistry

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When Copper is exposed to moist air for a long time, it acquires a green coating. This coating is:

ACopper Oxide

BCopper Carbonate

CBasic Copper Carbonate

DCopper Sulphate

✓ Correct Answer: C — Basic Copper Carbonate

The green patina on copper is basic copper carbonate [CuCO3.Cu(OH)2], formed by reaction with moisture and CO2.

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