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Question:

Which of the following species is not stable?

[SiF6]2−

[GeCl6]2−

[Sn(OH)6]2−

[SiCl6]2−

Solution:

Correct option is D. [SiCl6]2−
Due to the presence of d-orbitals in Si, Ge, and Sn, they form species like [SiF6]2−, [GeCl6]2−, [Sn(OH)6]2−. But [SiCl6]2− does not exist because six large chloride ions cannot be accommodated around Si4+ due to the limitation of its size.