Which complex has a metal ion with a d7 configuration in an octahedral field that is high spin?

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[Co(CN)6]3− [Co(H₂O)6]2+ Correct [Ni(NH₃)6]2+ [Fe(H₂O)6]3+

[Co(H₂O)6]2+ (Co₂+, d7) with weak field H₂O in an octahedral field is high spin (t2g5 eg2).

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