Zn salts are white while Cu2+ salts are coloured. WHY?

Zn has electronic configuration = 3d104s2

Zn2+ = 3d10

Cu = 3d54s1
Cu2+ = 3d4

In case of Zn fully filled d orbital is present therefore no d-d transition can be possible in this case and it is colorless. 

In case of copper because of d-d transition electrons emits light in the visible range and hence they are colored compounds.

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