Magnetic Properties

Identify the metal ion: In $[F e (CN)_{6}]^{4 -}$ , primary valence of $F e$ is $+ 2$ . $F e^{2 +}$ is $3 d^{6}$ .
Ligand Nature: $C N^{-}$ is a strong-field ligand.
Splitting: Strong-field ligands cause the electrons to pair up in the lower $t_{2 g}$ orbitals before filling $e_{g}$ .

$t_{2 g}^{6} e_{g}^{0}$ : All $6$ electrons are paired.

Magnetic Moment: Number of unpaired electrons ( $n$ ) = $0$ .

Formula: $μ = n (n + 2) = 0 BM$ .
The complex is diamagnetic.

This hard difficulty chemistry question is from the chapter d- and f-block elements, covering the topic of magnetic properties. It appeared in the 2025 exam.

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Magnetic Properties

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