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In SiF(6)^(2-) and SiCl(6)^(2-). which o...

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

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

Text Solution

Verified by Experts

The correct Answer is:
A
In `SiF_(6)^(2-) and SiCl_(6)^(2-), SiF_(6)^(2-)` is known due to the small size of F atoms. The small six F atoms can be easily accommodated around Si atom to form `SiF_(6)^(2-)` while in `SiCl_(6)^(2-)` , six large Cl atoms cannot be accommodated around Si atom
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iii. In SiF_6^(2-) and SiCl_6^(2-) , which one is known and why ?

Why [SiCl_(6)]^(-) cannot exist?

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.

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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.

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