Practice question

MCQ

Question

Which complex has the most unpaired electrons when the metal is in a +2 oxidation state in an octahedral field with weak field ligands?

Options

Choose one · Correct answer highlighted

[Fe(H₂O)6]2+ [Ni(H₂O)6]2+ [Mn(H₂O)6]2+ Correct [Co(H₂O)6]2+

Explanation

[Mn(H₂O)6]2+ (Mn₂+, d5) with weak field H₂O is high spin (t2g3 eg2), 5 unpaired electrons, the maximum among options.

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