Уравнять и дописать: KMnO4 + H2SO4 + HCOOH = K2Cr2O7 + H2SO4 + CH3COH = K2Cr2O7 + H2SO4 + C2H5OH = K2Cr2O7 + H2O + HCOOH =
1.
5HCOOH+2KMnO4+3H2SO4=K2SO4+2MnSO4+8H2O+5CO2