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Question

Out of the ions Ag+,Co2+,Ti4+, which one will be coloured in aqueous solutions.


[Atomic no : Ag = 47, Co = 27, Ti = 22]

A
Ag+
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B
Co2+
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C
Ti4+
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D
None of these
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Solution

The correct option is B Co2+
compound with unpaired d-electron will show color.

Ag+=5d10,n=0

Ti+4=3s23p6,n=0

Co+2=[Ar]3d7,n=3 It will show color due to unpaired d electrons.


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