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NEET levelSingle correct optionDifficulty 1 of 3df119

Among the following ions, the highest spin-only magnetic moment is shown by:

A $Fe X^{2 +}$ (high spin)
B $Ni X^{2 +}$
C $Mn X^{2 +}$
D $Cr X^{3 +}$

Answer: C

Unpaired electrons:

Mn X^{2 +}

5,

Fe X^{2 +}

4,

Cr X^{3 +}

3,

Ni X^{2 +}

2. The moment

n (n + 2)

is largest for

n = 5

, i.e. 5.92 BM, for

Mn X^{2 +}

.

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