Формулы кислотного оксида,кислоты,соли соответственно : 1) CaO;CaSO4;Ca(OH)2 2)P2O5; H3PO4;Na3PO4 3) Al2O3; Al(OH)3; AlCl3 4)P2O5;NaOH;Na3PO4 ПОЧЕМУ?

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