If copper is kept open in air,
Question:

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) CUCO3CO(OH)2

(c) CU(NO3)2

(d) CuO.

Solution:

(b). The green coating is due to the formation of basic copper carbonate which is CuCO3.Cu(OH)2.

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