(D) $[SiCl_{6}]^{2-}$ does not exist because:$(I)$ The size of the $Cl^{-}$ ion is large,so it cannot be accommodated around the small $Si^{4+}$ ion d

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(D) $[SiCl_{6}]^{2-}$ does not exist because:$(I)$ The size of the $Cl^{-}$ ion is large,so it cannot be accommodated around the small $Si^{4+}$ ion due to steric hindrance.$(II)$ The interaction between the lone pair of the chloride ion and the $Si^{4+}$ ion is not strong enough to stabilize the complex.