Написать уравнения реакций, в ходе которых можно осуществить превращения
Fe → FeO → FeCl2 → Fe(OH)2

AL → Al2 O3 → AL2 (SO4)3 → Al (OH)3 → Al2 O3 →AL

S →SO2 →SO3 → H2 SO4→BaSO4 → SO3
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