Practice question

MCQ

Question

Which complex has a metal ion that becomes diamagnetic when coordinated with 6 CN− ligands?

Options

Choose one · Correct answer highlighted

[Ni(H₂O)6]2+ [CoF₆]3− [Fe(H₂O)6]2+ Correct [Cr(H₂O)6]3+

Explanation

[Fe(H₂O)6]2+ (Fe₂+, d6) is high spin. With 6 CN− it becomes [Fe(CN)6]4−, low spin (0 unpaired electrons).

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