Составте уравнения окислительно-восстановительнх реакций:
Fe2O3+HNO3+K2KO3=K2FeO4+KNO2+.....
K2Cr2O7+FeSO4+H2SO4=Cr2(SO4)3+Fe2SO4+.....
PbS+H2O2=PbSO4+H2O
Br2+H2O=HBrO+HBr
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