将适量的Cl 2通过洗气瓶甲后，再通过盛有干燥的红布条的乙瓶，布条不褪色；若将Cl 2直接通入乙瓶，布条褪色．则甲瓶中所盛的试剂可能是 ①浓H 2SO 4   ②NaOH溶液   ③Na 2CO 3溶液   ④KI溶液

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