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Q.

The complex showing a spin only magnetic moment of 2.82 BM is

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a

$[Ni {(CO)}_{4}]$

b

${[Ni {(Cl)}_{4}]}^{- 2}$

c

${[Ni {(CN)}_{4}]}^{- 2}$

d

$[Ni {({PPh}_{3})}_{4}]$

answer is C.

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Detailed Solution

${[Ni {(Cl)}_{4}]}^{- 2}$ has two unpaired electrons.

2.82 = $\sqrt{n (n + 2)}$

on solving n = 2

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The complex showing a spin only magnetic moment of 2.82 BM is