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JEE Main levelSingle correct optionDifficulty 2 of 3df062

Among the following aqueous ions, the one with the highest spin-only magnetic moment is

A $Cr X^{3 +}$
B $Ni X^{2 +}$
C $Fe X^{3 +}$
D $Cu X^{2 +}$

Answer: C

Unpaired electrons:

Fe X^{3 +}

(

d^{5}

) has 5,

Cr X^{3 +}

(

d^{3}

) has 3,

Ni X^{2 +}

(

d^{8}

) has 2 and

Cu X^{2 +}

(

d^{9}

) has 1. With

μ = n (n + 2)

the values are 5.92, 3.87, 2.83 and 1.73 BM, so

Fe X^{3 +}

is highest.

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