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(i). Isomer ‘A’ reacts with AgNO₃ and gives white precipitate, as the complex consists of Cl it reacts with the AgNO₃ and gives the precipitate of AgCl and the reaction will be:

White

Hence isomer ‘A’ is

Similarly, in case of isomer ‘B’ it reacts with BaCl₂ and gives white precipitate and it is obviously BaSO₄ and the reaction will be:

White

Hence, the isomer ‘B’ will be

(ii)In this case, the counter ion (Cl^-) in the complex salt is itself a potential ligand and displaces the ligand (SO₄) which can then become the counter ion, therefore, it is a form of ionisation isomerism.

(iii) IUPAC name of isomer ‘A’-Pentaamminesulphatocobalt (III) chloride

And‘B’-Pentaamminechlorocobalt (III) sulphate.