In `SiF_(6)^(2-) and SiCl_(6)^(2-).` which one exist?

Options

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

Answer

A

Explanation

`SiF_(6)^(2-)` is known due to the small size of F-atoms. The small 6 F-atom can be easily accommodated around Si-atom to form `SiF_(6)^(2-)` while in `SiCl_(6)^(2-)`, 6 large Cl-atoms cannot be accomodated around Si-atom.