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JEE Main levelSingle correct optionDifficulty 2 of 3df122

The correct increasing order of spin-only magnetic moment for the ions $Sc X^{3 +}$ , $Ti X^{3 +}$ , $V X^{3 +}$ , $Cr X^{3 +}$ is:

A $Sc X^{3 +} < Ti X^{3 +} < V X^{3 +} < Cr X^{3 +}$
B $Cr X^{3 +} < V X^{3 +} < Ti X^{3 +} < Sc X^{3 +}$
C $Ti X^{3 +} < Sc X^{3 +} < V X^{3 +} < Cr X^{3 +}$
D $Sc X^{3 +} < Ti X^{3 +} < Cr X^{3 +} < V X^{3 +}$

Answer: A

Configurations:

Sc X^{3 +}

3 d^{0}

(n=0),

Ti X^{3 +}

3 d^{1}

(1),

V X^{3 +}

3 d^{2}

(2),

Cr X^{3 +}

3 d^{3}

(3). The moments are 0, 1.73, 2.83, 3.87 BM, which gives the first order.

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