(a) [CO(NH3)5Cl] SO4 → [CO(NH3)5Cl]+2 + SO42-
(b) [CO(NH3)5 SO4] Cl → [CO(NH3)5Cl] SO4
1. Aqueous solution of (a) gives sulphate ion. When an addition of BaCL, solution (a) gives white precipitate of BaSO4. But (b) does not give any precipitate.
2. Aqueous solution of (b) gives chloride ion. When an addition of AgNO3 solution (b) gives curdy white precipitate of AgCl. But (a) does not give any precipitate.