Identify the pairs of ions possessing equal spin only magnetic moments:

C o^{- 2}, N i^{+ 2}

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C o^{+ 2}, C r^{+ 3}

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F e^{+ 2}, F e^{+ 3}

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F e^{+ 2}, C r^{+ 3}

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Solution

The correct option is B $C o^{+ 2}, C r^{+ 3}$
Spin Magnetic moment is $\sqrt{n (n + 2)}$
where n is the number of unpaired electrons in $C o^{+ 2}$ and $C r^{+ 3}$ the number of unpaired electrons is $2$ . So they have same spin magnetic moment

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