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Cu^(2+) ions are coloured but Zn^(2+) io...

`Cu^(2+)` ions are coloured but `Zn^(2+)` ions are colourless. Give reason.

Text Solution

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`cu^(2+)` ions : Presence of unpaired electrons. Or `d^(9)` configuration
`zn^(2+)` ions : Absence of unpaired electrons
`d^(10)` configuration
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