下列反应，能说明卤素的非金属活泼顺序是Cl> Br >I的是 ①2HClO4+Br2(g)=2HBrO4+Cl2②2NaBr+Cl2 =2NaCl+Br2③2KI+Cl2 =2KCl+I2④2KI+ Br2 =2KBr +I2

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