Question

Which of the following species is not stable?

Answer 1

Correct option is D. $$[SiCl_6]^{2-}$$
Due to presence of d-orbital in $$Si,\ Ge$$ and $$Sn$$ they form species like $$[SiF_6]^{2-},\ [GeCl_6]^{2-}, \ [Sn(OH)_6]^{2-}$$ but $$SiCl^{2-}_6$$ does not exist because six large chloride ions cannot be accommodated around $$Si^{4+}$$ due to limitation of its size.