Указать окислитель, восстановитель и подобрать коэффициенты в уравнениях: PbO2 + Mn(NO3)2 + HNO3 →Pb(NO3)2 + HMnO 4 + H2O ; Al + K2Cr2O7 + H2SO4 →Al 2(SO4)3 + Cr2(SO4)3 + K2SO4 + H2O .
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