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Which one of the following will show paramagnetism corresponding to 2 unpaired electrons? (Atomic numbers: Ni = 28, Fe = 26)

1. [FeF6]3–
2. [NiCl4]2–
3. [Fe(CN)6]3–
4. [Ni(CN)4]2–

Correct answer: [FeF6]3–

Solution

Paramagnetism arises due to unpaired electrons. In [FeF6]3–, Fe is in the +3 oxidation state (d5 configuration). Fluoride is a weak field ligand, so pairing does not occur, leaving 2 unpaired electrons.

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