Which complex has a coordination number of 4 and is diamagnetic?

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[NiCl₄]2− [Ni(CN)4]2− Correct [Cu(NH₃)4]2+ [Fe(H₂O)4]2+

[Ni(CN)4]2− (Ni₂+, d8) with 4 strong field CN− ligands is square planar and diamagnetic (0 unpaired electrons).

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