已知酸性条件下有以下反应关系：
①KBrO3能将KI氧化成I2或KIO3，其本身被还原为Br2。
②Br2能将I-氧化为I2。
③KIO3能将I-氧化为I2，也能将Br-氧化为Br2，其本身被还原为I2。
(1)氧化剂(Br2、KBrO3、KIO3)氧化能力由强到弱的顺序为____。
(2)现向含有1 mol KI的硫酸溶液中加入含amol KBrO3的溶液，a的取值不同，所得产物也不同。试将讨论的结果填入下表中：
(3)若产物中碘单质和溴单质的物质的量相等时，a的值为____。
(1)KBrO3>KIO3>Br2
(2)A．
B、I2 、Br-.Br2 、H2O
D．
E 
；IO3-、Br2、H2O
(3) 
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