3.Схеме превращения N -3 = N+2 соответствует реакция, уравнение которой:
А) N2 + 3Н2 = 2NH3
Б) 2NO + О2 = 2NO2
В) 4NH3+ 5О2 = 4NO + 6H2O
Г) N2 + 3Ca = Ca 3N2
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