The complex showing a spin-only magnetic moment of $2.82 B . M$ . is:

N i (C O)_{4}

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[N i C l_{4}]^{2 -}

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N i (P P h_{3})_{4}

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[N i (C N)_{4}]^{2 -}

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Solution

The correct option is C $[N i C l_{4}]^{2 -}$
$[N i C l_{4}]^{2 -}, O . S$ . of $N i = + 2$

$N i (28) = [A r] 3 d^{8} 4 s^{2}$

$N i^{2 +} = [A r] 3 d^{8}$

Now,

Magnetic moment $μ = \sqrt{n (n + 2)}$

$\Rightarrow n =$ Number of unpaired electrons $= 2$

Therefore $μ = \sqrt{2 (2 + 2)}$

$= 2.82 B M$

Hence, option B is correct.

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