В какой из представленных ниже реакций бром проявляет свойства окислителя?
NaOH + HBr → NaBr + H2O
SO2 + Br2 + 2H2O → H2SO4 + 2HBr
2HBr + Cl2 → 2HCl + Br2
PBr3 + H2O → H3PO3 + 3HBr
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