Which of the following species have same magnetic moment?

C r^{+ 3}

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F e^{+ 3}

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C o^{+ 2}

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N i^{+ 2}

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Solution

The correct options are
A $C r^{+ 3}$
D $N i^{+ 2}$
$C r^{3 +} : 4 s^{0} 3 d^{3}$ number of unpaired $e^{-} = 3$
$F e^{3 +} : 4 s^{0} 3 d^{5}$ number of unpaired $e^{-} = 5$
$C a^{2 +} : 4 s^{0} 3 d^{6}$ number of unpaired $e^{-} = 4$
$N i^{2 +} : 4 s^{0} 3 d^{7}$ number of unpaired $e^{-} = 3$
$C r^{3 +}$ and $N i^{2 +}$ have same number of unpaired $e^{-}$ .
$∴$ They have same magnetic moment.

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