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SiF6^(2-) is known while SiCl6^(-2) is...

`SiF_6^(2-)` is known while `SiCl_6^(-2)` is not - explain.

Text Solution

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The main reasons are :
1) `Si^(+4)` is small in size.
2) It is not possible to accommodate six `Cl^-`ions around a small `Si^(+4)` ion.
3) The interaction of lone pairs on `Cl^-` ion and `Si^(+4)`ion is weak.
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