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Which of the following compound could not exists ?

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${[Sn {(OH)}_{6}]}^{-2}$

${[{SiCl}_{6}]}^{-2}$

${[{SiF}_{6}]}^{-2}$

${[{GeCl}_{6}]}^{-2}$

answer is B.

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Detailed Solution

[SiCl₆]^-2 does not exists due to

(i) six large chloride ions cannot be accommodated

around Si⁺⁴ due to limitation of its size

(ii) interaction between lone pair of chloride ion and Si⁺⁴ is not very strong

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