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Question

Which of the following arrangements does not represent the correct order of the property stated against it?

A
Cu3+< Fe3+ <Cr3+<Sc3+: stability in aqueous solution
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B
V2+< Cr2+<Fe2+<Mn2+: paramagnetic behaviour
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C
Ni2+< Co2+ <Fe2+ <Mn2+: ionic size
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D
Co3+< Fe3+ <Cr3+<Sc3+: stability in aqueous solution
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Solution

The correct option is A V2+< Cr2+<Fe2+<Mn2+: paramagnetic behaviour
The electronic configuration of various ionic species are:
No. of unpaired e
V2+ - [Ar] 3d34s0 3
Cr2+ - [Ar] 3d44s0 4
Mn2+ - [Ar] 3d54s0 5
Fe2+ - [Ar] 3d64s0 4
So, the paramagnetic behavior depends on the no. of unpaired e s. Hence more the no. of unpaired es, more paramagnetic species are , so the correct order is :
Mn2+ >Fe2+ > Cr2+ >V2+

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