The central metal atom M is in +3 oxidation state and ionisation isomers due to exchange of ligands outside & inside the co-ordination sphere are
[A][M(NH3)5SO4]Cl→AgNO3whitepptAgCl(s)↓
[B][M(NH3)5Cl]SO4→BaCl2whitepptBaSO4(s)↓
[A] and [B] are ionisation isomers