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Question:

An octahedral complex with molecular composition M.5NH3.Cl.SO4 has two isomers, A and B. The solution of A gives a white precipitate with AgNO3 solution and the solution of B gives a white precipitate with BaCl2 solution. The type of isomerism exhibited by the complex is:

ionisation isomerism

coordinate isomerism

geometrical isomerism

linkage isomerism

Solution:

A + AgNO3 → (x) white
White precipitate is AgCl (x).
This shows that Cl- is present as a counter ion in A.
B + BaCl2 → (y) white
White precipitate is BaSO4 (y).
This shows that SO42- is present as a counter ion in B.
A and B are ionisation isomers because they differ in the ions outside the coordination sphere. Therefore, the type of isomerism exhibited by the complex is ionization isomerism.