Final answer:
To separate aluminum oxide and ammonium ferrous sulfate, aluminum hydroxide is precipitated, converted to alumina by heating, and then subjected to electrolysis. Ammonium ferrous sulfate forms an insoluble sulfide in a basic solution that can be removed through filtration.
Step-by-step explanation:
To separate aluminum oxide and ammonium ferrous sulfate, different methods based on the chemical properties of each compound would be employed. Aluminum oxide, or alumina (Al2O3), can be prepared from aluminum hydroxide (Al(OH)3) which precipitates when sodium tetrahydroxoaluminate is cooled. Alumina can then be melted and subjected to electrolysis in a cryolite solution. On the other hand, ammonium ferrous sulfate [(NH4)2SO4·FeSO4], being a divalent iron salt, could form an insoluble sulfide in a basic solution with the addition of ammonium sulfide (NH4)2S, which precipitates out.
Iron sulfide (FeS) formed can be separated by filtration, while the remaining solution containing soluble compounds can be further processed to reclaim any dissolved metals or to remove excess ammonium sulfide.