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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss219

Using the spin-only formula, which of the following ions have a magnetic moment greater than $3.0 BM$ ?

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

Answer: B, D

Cr X^{3 +}

(

d^{3}

):

n = 3

, 3.87 BM.

Mn X^{2 +}

(

d^{5}

):

n = 5

, 5.92 BM.

Cu X^{2 +}

(

d^{9}

):

n = 1

, 1.73 BM.

Ni X^{2 +}

(

d^{8}

):

n = 2

, 2.83 BM. Only the first two exceed 3.0 BM.

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