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

Question : Which of the following species is not stable ?

(1) [SiF₆]^2-                  (2) [GeCl₆]^2-

(3) [Sn(OH)₆]^2-              (4)  [SiCl₆]^2-

answer : from all above options the correct answer is “(4)  [SiCl₆]^2- ” because other three compounds are stable means  [SiF₆]^2- , [GeCl₆]^2- and also [Sn(OH)₆]^2- is stable in nature but ‘[SiCl₆]^2- ‘ is unstable in nature that is we have marked this option for correct answer.

Answer explanation : Silicon can not form the complex [SiCl₆]^2- as size of silicon is smaller and due to steric hinderence , silicon can not bear six big Cl^– ions. Hence the correct answer is option (4) that is [SiCl₆]^2- species is not stable.