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Question

Increasing order of magnetic moment among the following species is:
Na+,Fe+3,Co+2,Cr+2

A
Na+<Co2+<Cr2+<Fe3+
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B
Na+<Fe3+<Cr2+<Co2+
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C
Cr2+<Co2+<Na+<Fe3+
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D
Co2+<Na+<Cr2+<Fe3+
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Solution

The correct option is D Na+<Co2+<Cr2+<Fe3+
Magnetic moment is μ=n(n+2), where n is no. of unpaired electron so more no. of unpaired electron means more magnetic moment.

Na+ has zero unpaired electron
Co2+ has 3 unpaired electrons
Cr2+ has 4 unpaired electrons
Fe3+ has 5 unpaired electron

The order is Na+<Co2+<Cr2+<Fe3+.

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