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iii. In SiF6^(2-) and SiCl6^(2-) , wh...

iii. In ` SiF_6^(2-) ` and ` SiCl_6^(2-)` , which one is known and why ?

A

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

B

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

C

`SiCl_(6)^(2-)` because of small size of Cl

D

`SiCl_(6)^(2-)`because of large size of Cl

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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.

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.