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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3qc099

Select the correct statements (high-spin unless a strong-field ligand is stated).

A $Cr X^{3 +}$ has three unpaired electrons
B $[Fe (CN) X_{6}] X^{3 -}$ has five unpaired electrons
C $Fe X^{3 +}$ in aqueous solution has five unpaired electrons
D $[Fe (CN) X_{6}] X^{4 -}$ is diamagnetic

Answer: A, C, D

Fe X^{3 +}

is

d^{5}

(5 unpaired) with water as a weak-field ligand;

Cr X^{3 +}

is

d^{3}

(3 unpaired);

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

is low-spin

d^{6}

with

t_{2 g}^{6}

(diamagnetic).

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

is low-spin

d^{5}

with only one unpaired electron.

Practice Qualitative Analysis: Cations More on Group III cations (Fe, Al, Cr)

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