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Question

How many among the following ions are expected to be coloured? Cu+,Fe2+,Mn2+,Cr3+,Sc3+,Ti4+

A
1
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B
4
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C
3
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D
2
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Solution

The correct option is C 3
Colour arises from the electronic transition of unpaired electrons. Electrons abosrb energy and get excited to a higher energy level, when they get de-excited, they radiate energy in a certain wavelength which is responsible for the colour.
Electronic configuration of ions:
Cu+:[Ar]3d10
Fe2+:[Ar]3d6
Mn2+:[Ar]3d5
Cr3+:[Ar]3d3
Sc3+:[Ar]3d0
Ti4+:[Ar]3d0
Cu+, Sc3+ and Ti4+ do not have any unpaired electrons and hence they do not exhibit colour.

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