Which of the following is low spin complex?

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[CoF₆]^2–

[Ni(CN)₄]^2–

[NiCl₄]^2–

[MnCl₄]^2–

answer is C.

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Detailed Solution

Weak field ligands forms outer orbital complexes because they cause less splitting and unable to paired outer electrons of the central metal atom. They form high spin complexes. Fluoride ion, chloride ion, bromide ion and so on are the examples of weak field ligand. Cyanide ion is a strong ligand which causes high splitting and forms low spin complex or inner orbital complex.

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