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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