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Of the following complex ions, which is diamagnetic in nature?

1. [NiCl₄]²⁻
2. [Ni(CN)₄]²⁻
3. [CuCl₄]²⁻
4. [CoF₆]³⁻

Correct answer: [Ni(CN)₄]²⁻

Solution

The complex [Ni(CN)₄]²⁻ is diamagnetic because CN⁻ is a strong field ligand that causes pairing of electrons in the d-orbitals of Ni²⁺, leaving no unpaired electrons. Other complexes have unpaired electrons due to weak field ligands or different electronic configurations.

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