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Question: Answered & Verified by Expert
Which one of the following is square planar in structure and has diamagnetic property?
ChemistryChemical Bonding and Molecular StructureTS EAMCETTS EAMCET 2018 (07 May Shift 1)
Options:
  • A $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
  • B $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$
  • C $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^2$
  • D $\left[\mathrm{NiCl}_4\right]^2$
Solution:
2598 Upvotes Verified Answer
The correct answer is: $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^2$
$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ have $\mathrm{CN}^{-}$as strong field ligand which helps in pairing of electron thus 2 unpaired electrons of nickel are paired up due to which the coordinated ion is diamagnetic with $d s p^2$ hybridisation and square planar geometry.

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