Which complex is diamagnetic?

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Question

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

[Co(NH₃)6]3+ (Co₃+, d6) with strong field NH₃ in an octahedral field is low spin (t2g6), with 0 unpaired electrons.

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