alleryMagnetic susceptibility of Fe³⁺ vs Fe²⁺ in high-spin complexes:
AFe³⁺ (d⁵, 5 unpaired) > Fe²⁺ (d⁶, 4 unpaired)
BBoth zero
CEqual
DFe²⁺ greater
Answer & Solution
Correct answer: A. Fe³⁺ (d⁵, 5 unpaired) > Fe²⁺ (d⁶, 4 unpaired)
Fe³⁺ high spin: d⁵, μ = 5.92 BM.
Fe²⁺ high spin: d⁶, t₂g⁴ e_g², 4 unpaired, μ = 4.90 BM.
Hence Fe³⁺ more paramagnetic.
Useful for distinguishing Fe oxidation states magnetically.
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