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JEE Advanced levelSingle correct optionDifficulty 3 of 3ss216

A 3d-series ion of charge +3 has a spin-only magnetic moment of $5.92 BM$ . The ion is

A $Co X^{3 +}$ (low spin)
B $Cr X^{3 +}$
C $Fe X^{3 +}$
D $Mn X^{3 +}$

Answer: C

μ = n (n + 2) = 5.92

gives

n (n + 2) = 35

, so

n = 5

. A

d^{5}

configuration with +3 charge corresponds to

Fe X^{3 +}

(

3 d^{5}

).

Mn X^{3 +}

(

d^{4}

) gives 4.90 BM,

Cr X^{3 +}

gives 3.87 BM and low-spin

Co X^{3 +}

gives 0.

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