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

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

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[SiF_(6)]^(2-) is known where as [SiCI_(6)]^(2-) does not exist because I) Six large chloride ions cannot be accommodated around Si^(4+) II) Ineraction between lone pair of chloride ion and Si^(4+) is not very strong III) Silicon is less electronegative than chlorine IV) Si^(4+) and Cl^(-) ions have same size

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Assertion (A) [SiF_(6)]^(2) is formed but [SiCl_(6)]^(2-) is not Reason (R ) Electronegativity (EN) of F is higher than EN of Cl

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