Question

[SiF6]-2 is known whereas [SiCl6]-2 not . Give reasons.

Answer 1

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Answer...

There are two main reasons responsible for this →

1. six large chloride ions can't form bond with Si^+4 due to limitation in size .

2. interaction between the lone pair of Cl- ions and Sr^+4 is not very strong.

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Answer 2

SIZE OF FLUORINE IS SMALL AND ITS LONE PAIR OF ELECTIONS INTERACT WITH d-ORBITAL OF SI STRONGLY.

So [SIF6)] -2 IS KNOWN WHEREAS [SICL6]-2 NOT