Question

Which of the following species is not stable?
(1) [SiF₆]²⁻
(2) [GeCl₆]²⁻
(3) [Sn(OH)₆]²⁻
(4) [SiCl₆ ]²⁻

Answer 1

$\bold{[SiCl_{6}]^{2-}}$ is not stable.

Step by step explanation:

• Silicon, Germanium and Tin elements have d- orbitals.

• Due to the presence of d- orbitals in their outermost energy level to form a complex compounds with the different elements.

• For example,

• Silicon forms a complex compounds with chlorine and fluorine.

• They are $\bold{[SiCl_{6}]^{2-}}$ and $\bold{[SiF_{6}]^{2-}}$. And all given complexes have ligands.

• Among them given complexes $\bold{[SiCl_{6}]^{2-}}$ is not exist.

• Because six chloride not possible to accomodate around the silicon element.

• The oxidation state of silicon is +4.

• Hence, it can accommodate only four chlorine atoms only.

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