Q32 / 160 · TS EAMCET 2018 (07 May Shift 1) · Chemistry

Which one of the following is square planar in structure and has diamagnetic property?

  • A
    $\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
  • B
    $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$
  • Correct answer
    C
    $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^2$
  • D
    $\left[\mathrm{NiCl}_4\right]^2$

Solution

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

Hence, the correct answer is option: 'C'.

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