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Q.

Which of the following species is not stable?

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a

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

b

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

c

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

d

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

answer is D.

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Detailed Solution

${[S i C l_{6}]}^{- 2}$ does not exist because six large chlorides ions cannot be accomodaes around $S i^{+ 4}$ , due to smaller size.

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