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JEE Main levelOne or more correct optionsDifficulty 2 of 3df021

Select ALL gaseous free ions that have a spin-only magnetic moment of $3.87 BM$ .

A $Ni X^{2 +}$
B $Cr X^{3 +}$
C $Co X^{2 +}$
D $V X^{2 +}$

Answer: B, C, D

μ = 3.87 BM

needs

n = 3

since

15 = 3.87

.

Cr X^{3 +}

(

d^{3}

),

V X^{2 +}

(

d^{3}

) and

Co X^{2 +}

(

d^{7}

, 3 unpaired) qualify.

Ni X^{2 +}

(

d^{8}

) has 2 unpaired electrons (2.83 BM).

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