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Which of the following do you expect to ...

Which of the following do you expect to be coloured out of `Cr^(+)` or `Cu^(+)` and why?

Text Solution

Verified by Experts

The electronic configurations of `Cr^(+)` and `Cu^(+)` are
`Cr^(+) : 4s^(0)3d^(5)`
`Cu^(+) : 4s^(0)3d^(10)`
`Cr^(+)` has unpaired electrons in the d-subshell and is, therefore, coloured. On the other hand, `Cu^(+)` is colourless because it does not have unpaired electrons.
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