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Which is diamagnetic?

1. [Fe(CN)6]^3–
2. [CoF6]^3–
3. [Ni(CN)4]^2–
4. [NiCl4]^2–

Correct answer: [Ni(CN)4]^2–

Solution

Diamagnetic substances have all electrons paired. [Ni(CN)4]^2– has a strong field ligand (CN–) that causes pairing of electrons in Ni, making it diamagnetic.

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