Составить уравнения следующих превращений:
S →SO2 → SO3 → Na2SO4 → PbSO4
Fe → Fe2O3 → Fe2(SO4)3 → BaSO4
C → CO2 → Na2CO3 → MgCO3
Zn → ZnO → ZnSO4 → Zn3(PO4)2
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