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Question

Which of the following species is not stable?

A
[SiF6]2
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B
[GeCl6]2
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C
[Sn(OH)6]2
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D
[SiCl6]2
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Solution

The correct option is D [SiCl6]2
Due to the presence of d-orbitals in Si,Ge and Sn they form species like [SiF6]2, [GeCl6]2, [Sn(OH)26].

[SiCl6]2 does not exist because six chloride ions cannot be accomadated around Si4+ due to its smaller size. The repulsion between the chloride ions will be more which makes [SiCl6]2 unstable.

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