Осуществите цепочки следующих превращений:     

    а)  Mg → MgO→MgCl2→Mg(OH)2 →  MgO    

    б)  C → CO2 → Na2CO3 → Na2SO4 → BaSO4

    в)S → SO2 → SO3 → H2SO4 → ZnSO4​
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