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JEE Main levelOne or more correct optionsDifficulty 2 of 3df142

Which of the following high-spin ions have a spin-only magnetic moment of 4.90 BM?

A $Co X^{2 +}$
B $Cr X^{2 +}$
C $Fe X^{2 +}$
D $Mn X^{3 +}$

Answer: B, C, D

4.90 BM corresponds to

n = 4

.

Cr X^{2 +}

is

d^{4}

,

Mn X^{3 +}

is

d^{4}

and high-spin

Fe X^{2 +}

is

d^{6}

(

t_{2 g}^{4} e_{g}^{2}

), each with 4 unpaired electrons. High-spin

Co X^{2 +}

is

d^{7}

with

n = 3

(3.87 BM).

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