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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss048

Using the spin-only formula, which statements about the ions are correct?

A $Cu X^{2 +}$ is paramagnetic with $μ \approx 1.73$ BM.
B $Zn X^{2 +}$ is diamagnetic.
C $Ni X^{2 +}$ has $μ \approx 3.87$ BM.
D $Mn X^{2 +}$ and $Fe X^{3 +}$ have the same spin-only moment.

Answer: A, B, D

Cu X^{2 +}

(

d^{9}

,

n = 1

):

3 = 1.73

.

Zn X^{2 +}

(

d^{10}

) has no unpaired electron.

Ni X^{2 +}

(

d^{8}

) has

n = 2

, so

μ = 8 = 2.83

, not 3.87.

Mn X^{2 +}

and

Fe X^{3 +}

are both

d^{5}

(

n = 5

),

μ = 35 = 5.92

.

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