已知：2BrO3－ +Cl2="Br2" +2ClO3－；5Cl2 +I2 +6H2O ="2HIO3" +10HCl；ClO3－ +5Cl－ +6H+ =3Cl2+3H2O 下列物质氧化能力强弱顺序为
A．ClO3－＞BrO3－＞IO3－＞Cl2
B．BrO3－＞Cl2＞ClO3－＞IO3－
C．BrO3－＞ClO3－＞Cl2＞IO3－
D．Cl2＞BrO3－＞ClO3－＞IO3－
答案：C
由同一氧化还原方程式中还原剂的还原性大于还原产物的还原性，氧化剂的氧化性大于氧化产物的氧化性可得：氧化性强弱为：BrO3－＞ClO3－＞Cl2＞IO3－
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