hno3+cu->cu(no3)2+no2+h2o

Cu+4HNO3(конц.) =Cu(NO3)2+2NO2+2H2O

Cu(0) -2e = Cu(+2)    -1окисление;восстановитель

N(+5) +1e = NN(+4)  -2восстановление;окислитель

Cu(0) + 2N(+5) = Cu(+2) +N(+4)

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