The d-electron configuration of $C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +}$ are $d^{4}$ , $d^{5}$ , $d^{6}$ and $d^{7}$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

$M n^{2 +}$

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$F e^{2 +}$

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$C o^{2 +}$

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$C r^{2 +}$

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Solution

The correct option is C
$C o^{2 +}$

The d-electron configuration of $C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +}$ are $d^{4}$ , $d^{5}$ , $d^{6}$ and $d^{7}$ respectivelyAs spin only magnetic moment is $\sqrt{n (n + 2)} B . M .$ where n is no. of unpaired electron.
So ion with minimum number of unpaired electron will have minimum paramagnetism.
$C o^{2 +}$ have minimum paramagnetic behaviour as it has minimum unpaired electron.

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Similar questions

Q. The d-electron configuration of

C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +}

are

d^{4}

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respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

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C r^{2 +}, M n^{2 +}, F e^{2 +}

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The d-electron configuration of Cr2+,Mn2+,Fe2+andCo2+ are d4,d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

The d-electron configuration of $C r^{2 +}, M n^{2 +}, F e^{2 +} and C o^{2 +}$ are $d^{4}$ , $d^{5}$ , $d^{6}$ and $d^{7}$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)