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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc207

Which of the following has the same spin-only magnetic moment as $[Ti (H X_{2} O) X_{6}] X^{3 +}$ ?

A $[Fe (CN) X_{6}] X^{3 -}$
B $[Fe (CN) X_{6}] X^{4 -}$
C $[CoF X_{6}] X^{3 -}$
D $[Ni (CN) X_{4}] X^{2 -}$

Answer: A

Ti X^{3 +}

is

3 d^{1}

, giving

μ = 3 = 1.73

BM.

[Fe (CN) X_{6}] X^{3 -}

is low-spin

d^{5}

with one unpaired electron,

1.73

BM.

[Fe (CN) X_{6}] X^{4 -}

is

d^{6}

low spin (0),

[CoF X_{6}] X^{3 -}

is high-spin

d^{6}

(

4.90

BM) and

[Ni (CN) X_{4}] X^{2 -}

is diamagnetic.

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