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Which of the following species is not stable?

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

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

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

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

answer is A.

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Detailed Solution

[SiCl₆]^2– species exist as six large Cl– ions cannot be accommodated around Si⁺⁴ due to limitation of its size. [SiF₆]^–2, [GeCl₆]^–2 and [Sn(OH)₆]^–2 exist due to availability of vacent d-orbitals

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