Q. 165.0( 7 Votes )

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

Answer :

Copper gets green coating due to the formation of a mixture of copper carbonate and copper hydroxide when it reacts with carbon dioxide gas and moisture present in air. This is called tarnishing of copper.


The reactionn is as follows:
2Cu + H2O + CO2 + O2
Cu(OH)2 + CuCO3

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