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