10. Выберите уравнения реакций, в которых азот является восстановителем:
1) N2 + 3Mg = Mg3N2
2) 4NH3 + 3O2 = 2N2 + 6H2O
3) 2NO2 + 7H2 = 2NH3 + 4H2O
4) 4NO2 + O2 + 4KOH = 4KNO3 + 2H2O
5) 8HNO3 + H2S = H2SO4 + 8NO2 + 4H2O
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