Practice question
Question
Which complex has a d6 metal ion that remains paramagnetic even with strong field ligands in an octahedral field?
Explanation
[Fe(CN)6]4− (Fe₂+, d6) with strong field CN− is low spin (t2g6), 0 unpaired electrons. [Co(H₂O)6]3+ (Co₃+, d6) with weaker H₂O is high spin, but [Fe(H₂O)6]2+ fits better contextually.
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