Q. Which one of the following has a square planar geometry? (At. No. Fe=26, Co=27, Ni=28, Pt=78)
A) $\left\lbrack {CoCl}_{4} \right\rbrack^{2 -}$
B) $\left\lbrack {FeCl}_{4} \right\rbrack^{2 -}$
C) $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$
D) $\left\lbrack {PtCl}_{4} \right\rbrack^{2 -}$
Explanation
(d)
$Cl^{-}$ is a weak ligand but $Cl^{-}$ cause the pairing of electron with large $Pt^{2 +}$ and consequently give $dsp^{2}$ hybridisation and square planar geometry.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.