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
CuSO4
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B
CuCO3
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C
Cu(NO3)2
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D
CuO
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Solution
The correct option is BCuCO3 The green coat is due to the basic copper carbonate formation and is a mixture of copper carbonate and copper hydroxide (CuCO3 and Cu(OH)2).