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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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`Zn^(2+)` has completely filled d-orbitals. Hence d-d transition of electrons is not possible and it can not absorb any radiation.
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