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Question

Chemistry Question on p -Block Elements

Which of the following species is not stable ?

A

[Sn(OH)6]2−[Sn(OH)_6]^{2-}

B

[SiCl6]2−[SiCl_6]^{2-}

C

[SiF6]2−[SiF_6]^{2-}

D

[GeCl6]2−[GeCl_6]^{2-}

Answer

[SiCl6]2−[SiCl_6]^{2-}

Explanation

Solution

∙\bullet Due to presence of d-orbital in Si, Ge and Sn they form species like SiF62−,[GeCl6]2−,[Sn(OH)6]2−{SiF_6^{2-} , [GeCl_6]^{2-} , [Sn(OH)_6]^{2-}}
∙\bullet SiCl62−{SiCl_6^{2-}} does not exist because six large chloride ions cannot be accommodated around Si4+{Si^{4+}} due to limitation of its size.