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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df044

Select ALL gaseous free ions in their ground state that have a spin-only magnetic moment of $5.92 BM$ .

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

Answer: A, C, D

5.92 BM

corresponds to

n = 5

(

35

).

Mn X^{2 +}

,

Fe X^{3 +}

and

Cr X^{+}

(ground state

3 d^{5}

) all have five unpaired electrons.

Co X^{3 +}

is

d^{6}

with 4 unpaired electrons in the free ion (4.90 BM).

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