Расставьте коэффициенты. Укажите тип реакции.
HgO=Hg +O2; CaO+ H2O= Ca(OH)2; (NH4)2Cr2O7=Cr2O3+N2+H2O;
H2O+B2O3=H3BO3; P2O5+H2O=H3PO4; CaO+ P2O5= Ca3(PO4)2
Al+ FeO= Al2O3 + Fe; Cl2O7+H2O= HClO4.
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