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二氧化氯（ClO 2 ）为一种黄绿色气体，是国际上公认的高效、广谱、快速、安全的杀菌消毒剂． （1）工业上制备ClO 2 的反应原理常采用：2NaClO 3 +4HCl=2ClO 2 ↑+Cl 2 ↑+2H 2 O+2NaCl． ①浓盐酸在反应中显示出来的性质是______（填序号）． A．只有还原性B．还原性和酸性C．只有氧化性D．氧化性和酸性 ②若上述反应中产生0.1molClO 2 ，则转移电子的物质的量为______mol． （2）目前已开发出用电解法制取ClO 2 的新工艺． ①如图示意用石墨做电极，在一定条件下电解饱和食盐水制取ClO 2 ．写出阳极产生ClO 2 的电极反应式：______． ②电解一段时间，当阴极产生的气体体积为112mL（标准状况）时，停止电解．通过阳离子交换膜的阳离子的物质的量为______mol；用平衡移动原理解释阴极区pH增大的原因______． （3）ClO 2 对污水中Fe 2+ 、Mn 2+ 、S 2- 和CN - 等有明显的去除效果．某工厂污水中含CN - amg/L，现用ClO 2 将CN - 氧化，只生成两种气体，其离子反应方程式为______；处理100m 3 这种污水，至少需要ClO 2 ______mol．
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