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Explain why : Zn^(2+) salts are whit...

Explain why :
`Zn^(2+)` salts are white whereas `Cu^(2+)` salts are coloured.

Text Solution

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`Zn^(2+)` has `3d^(10)` configuration and no unpaired electrons, hence it is colourless. Whereas in `Cu^(2+)` state which has `3d^(9)` configuration there is one unpaired electron and it undergoes d-d transitions emiting colour so `Cu^(2+)` salts are blue in colour.
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