In `SiF_(6)^(-2)` because of small size of F

Assertion: SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of Si strongly.

Assertion: SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of Si strongly.

Assertion (R) SF_(6) is known but SCl_(6) is not. Reason (R) Due to small size of F.

In H_(2)SiF_(6) the covalency of silicon is

Statement-I: SiF_(6)^(-2) is known but SiCl_(6)^(-2) in not known Statement-II: Interaction of 'F' lone pair electrons with 'Si' is stronger than that of chlorine and due to smaller size of 'F' steric repulsion will bel less.

Assertion (A): F-F bond in F_(2) melocule is weak. F atom is small in size.