Осуществить превращение:
а) HCl + ? → FeCl 2 + ?
б) Mg + ? → H 2 + ?
в) Na 2 O + H 2 SO 4 → ? + ?
г) ZnO + ? → ZnSO 4 + ?
д) H 3 PO 4 + ? → K 3 PO 4 + ?
е) S → SO 3 → H 2 SO 4 → CaSO 4
ж) P → P 2 O 5 → H 3 PO 4 → Na 3 PO 4
з) C → CO 2 → CaCO 3 → H 2 CO 3 → BaCO 3

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