срочно!Уровнять окислительно-восстановительные реакции
1)SO2+HN3+H2O=H2SO4+NO
2)FeCl3+Br2+KOH=K2FeO4+KBr+KCl+H2O
3)NaCl+MnO2+H2SO4=Cl2+MnSO4+Na2SO4+H2O
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