A P2O5+3H2O→2H3PO4
B ZnSO4+KOH→ZnOH2+K2SO4
ZnOH2+KOH→K2ZnO2+H2O
C Cl2+CH3-CHO→CCl3-CHO+HCl
D Cu+4HNO3→CuNO32+2H2O+2NO2
E Al2SO43+NaOH→AlOH3+Na2SO4;
AlOH3+NaOH→Na AlO2+H2O
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