Which of the following species is not stable?

[S i F_{6}]^{2 -}

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[G e C l_{6}]^{2 -}

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[S n (O H)_{6}]^{2 -}

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[S i C l_{6}]^{2 -}

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Solution

The correct option is D $[S i C l_{6}]^{2 -}$
Due to the presence of d-orbitals in $S i, G e$ and $S n$ they form species like $[S i F_{6}]^{2 -}$ , $[G e C l_{6}]^{2 -}$ , $[S n (O H)_{6}^{2 -}]$ .

$[S i C l_{6}]^{2 -}$ does not exist because six chloride ions cannot be accomadated around $S i^{4 +}$ due to its smaller size. The repulsion between the chloride ions will be more which makes $[S i C l_{6}]^{2 -}$ unstable.

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