Question

Which of the following has square planar geometry?

• A. $\left[PtCl_{4}\right]^{2-}$
• B. $\left[NiCl_{4}\right]^{2-}$
• C. $\left[ZnCl_{4}\right]^{2-}$
• D. $\left[CoCl_{4}\right]^{2-}$

Answer 1

Answer: (A)

$\left[ PtCl _{4}\right]^{2-}$ has square planar geometry. $Pt : 5 d^{9} 6 s^{1}$ Two electrons are removed from $5 d$ shell and $6\, s$ shell. So, hybridisation takes place is $d s p^{2}$ i.e. square planar geometry.