Solution

Due to the presence of d-orbitals in Si, Ge and Sn, they form species like $[SiF_6]^{2-}$, $[GeCl_6]^{2-}$ and $[Sn(OH)_6]^{2-}$. $[SiCl_6]^{2-}$ does not exist because six large chloride ions cannot be accommodated around $Si^{4+}$ due to its small size.

Concept stability of hexa-coordinated species

The p-Block Elements (Group 13 and 14) in past papers

9 questions from this chapter have appeared across 4 exam years.