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Q.

The magnetic moment (Spin only) of ${({NiCl}_{4})}^{- 2}$ is ________(nearest whole number)

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answer is 3.

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Detailed Solution

Cl⁻is a weak field ligand and therefore, Ni²⁺ion will have two unpaired electrons(n=2) with d⁸configuration.
$μ = \sqrt{n (n + 2)} = \sqrt{2 (2 + 2)} = \sqrt{8} = 2.82 BM .$

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