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  • 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 (b) CuCO3 (c) Cu(NO3)2 (d) CuO

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
(b) CuCO3
(c) Cu(NO3)2
(d) CuO

Answers (1)

Ans. (b)

Copper reacts with oxygen present in air and forms a green coating on its surface due to the formation of basic copper carbonate [CuCO3 and Cu(OH)2]

The reaction is given as:
2Cu + O2 (From air) + CO2 + H2O \rightarrowCuCO3 + Cu(OH)2
Basic copper carbonate(green coating)

Therefore option (B) is correct

 

 

 

Posted by

infoexpert27

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