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  4. Which one of the silicon components does not exist?

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Q. Which one of the silicon components does not exist?

AMUAMU 2015The p-Block Elements

Solution:

$\left[ SiCl _{6}\right]^{2-}$ does not exist because the chlorine atom is much larger atom which does not allow the six chlorines to surround the silicon due to repulsions between chlorine atoms. Silicon cannot accommodate $6$ chlorine around it.
Hence, due to inter electron repulsion between chlorine atoms, the compound $\left[ SiCl _{6}\right]^{2-}$ is unstable and not known.