2. Серед наведених сполук укажіть сіль а) SO3, б)K2SО4, в)H2SО4., г)MgSO4, д)MgO. Е)H3PO4, €)P2O5, жNa3PO4. 3)Н3РО4,к) Р2О5, л)Na3PO4.​
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