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JEE Main levelSingle correct optionDifficulty 2 of 3df133

Which of the following pairs of high-spin aqueous ions have the same spin-only magnetic moment?

A $Cr X^{3 +}$ and $Mn X^{3 +}$
B $Fe X^{3 +}$ and $Fe X^{2 +}$
C $V X^{3 +}$ and $Ni X^{2 +}$
D $Ti X^{3 +}$ and $V X^{3 +}$

Answer: C

V X^{3 +}

is

d^{2}

(2 unpaired) and

Ni X^{2 +}

is

d^{8}

(2 unpaired), so both have 2.83 BM. The other pairs have 3 and 4, 5 and 4, and 1 and 2 unpaired electrons.

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