Which complex has a d4 metal ion with 2 unpaired electrons in an octahedral field?

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

[Mn(CN)6]3− (Mn₃+, d4) with strong field CN− is low spin (t2g4), 2 unpaired electrons.

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