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Aqueous Cu^(2+) ions are blue in colour,...

Aqueous `Cu^(2+)` ions are blue in colour, where as Aqueous `Zn^(2+)` ions are colourless. Why ?

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`Cu^(++)` contains unpaired electron. It is coloured due to d-d fransition. `Zn^(++)` .does not contain unpaired, electron. Hence it is colourless.
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