Coordination Compounds 2 Question 33

####35. The complex showing a spin only magnetic moment of $2.82 BM$ is

(2010)

(a) $Ni(CO) _4$

(b) $\left[NiCl _4\right]^{2-}$

(c) $Ni\left(PPh _3\right) _4$

(d) $\left[Ni(CN) _4\right]^{2-}$

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Answer:

Correct Answer: 35. (a)

Solution:

  1. Magnetic moment $=2.83 BM$ indicates that there is two unpaired electrons.

$$ u=\sqrt{n(n+2)} BM=\sqrt{8} BM=2.82 BM $$

$In\left[NiCl _4\right]^{2-}$, $Ni$ has $d^{8}$ configuration and $Cl^{-}$is a weak ligand :



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