2. Запишите уравнения реакций, соответствующих схемам превращений:
а) Сa  CaO  CaCO3  CaCl2  CaSO4
б) Mg  MgCl2  Mg(OH)2  MgSO4  BaSO4
в) P  P2O5  H3PO4  Na3PO4  Ca3(PO4)2
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