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( 10分) “84消毒液”与硫酸溶液反应可以制取氯气（NaClO+ NaCl+H 2 SO 4 Na 2 SO 4 + Cl 2 ↑+H 2 O） 为探究氯气的性质，某同学此原理制氯气并设计了如下所示的实验装置 请回答： （1）从①、②、③装置中选择合适的制气装置（A处） (填写序号)。 （2）装置B、C中依次放的是干燥的红色布条和湿润的红色布条，实验过程中该同学发现装置B中的布条也褪色，其原因可能是 ，说明该装置存在明显的缺陷，请提出合理的改进的方法 。 （3）为了验证氯气的氧化性，将氯气通Na 2 SO 3 溶液中，写出氯气与Na 2 SO 3 溶液反应的离子方程式 。 （4）氯气通入饱和NaHCO 3 溶液能产生无色气体，已知酸性盐酸>碳酸>次氯酸，该实验证明氯气与水反应的生成物中含有 。
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