An octahedral complex with molecular composition $M.5N{H}_3.Cl.S{O}_4$  has two isomers, A and B. The solution of A gives a white precipitate with $AgN{O}_3$ solution and the solution of B gives white precipitate with  $BaC{l}_2$ solution. The type of isomerism exhibited by the complex is: 

The two possible isomers for the given octahedral complex are  $\left[M{\left(N{H}_3\right)}_{5}S{O}_4\right]Cl$ and  $\left[M{\left(N{H}_3\right)}_{5}Cl\right]S{O}_4$. They respectively give chloride ion (indicated by precipitation with  $AgN{O}_3$) and sulphate ion (indicated by precipitation with $BaC{l}_2$). Hence, the type of isomerism  exhibited by the complex is ionization isomerism