text: 1) Sulphuric acid will form a ppt with Ba 2+ as barium sulphate is insoluble. It wont form with Fe3+ as iron sulphate is soluble.\n\n2)HCl will form a ppt with Ag (AgCl is insoluble) \n\n3)Sodium sulphate can  separate this. Lead sulphate is insoluble\n\n4)Any carbonate can be used to separate this as Magnesium Carbonate forms a ppt.