Q.
The octahedral complex [Co(NH3)5SO4]Cl exists in two isomeric forms X and Y. Isomer X reacts with AgNO3 to give a white precipitate, but does not react with BaCl2. Isomer Y gives white precipitate with BaCl2 but does not react with AgNO3 Isomers X and Y are
To give precipitate with AgNO3, the isomer must be [Co(NH3)5SO4]Cl and
to give precipitate with BaCl2, it must be [Co(NH3)5.Cl]SO4.
They are ionisation isomers.