Определите окислитель и восстановитель в следующих реакциях:

А) SO2 + NO2 = SO3 + NO

Б) 4NO2 + O2 + H2O = 4HNO3

В) H2S + 2Na = Na2S + H2

Г) 2NH3 + 2Na = 2NaNH2 + H2
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