2KMnO4+KNO2+2KOH=2K2MnO4+KNO3+H2O
Mn(+7) +1e=Mn(+6)-2-в-ние; ок-ль.
N(+3) -2e=N(+5) - 1-ок-ние; в-ль.
2Mn(+7)+N(+4) =2 Mn(+6) + N(+5)
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