СРОЧНО!!!Выберите реакции, в которых участвует один окислитель и два восстановителя.
2KMnO4→tK2MnO4+MnO2+O2

Cu2S + 2O2→t2CuO+SO2

2FeSO3+3H2O2+H2SO4=Fe2(SO4)3+4H2O

2AgNO3→t2Ag+2NO2 +O2

PH3+8HNO3=H3PO4+8NO2+4H2O
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