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题文

下列叙述中正确的是

A.能使润湿的淀粉KI试纸变成蓝色的物质一定是Cl2
B.某溶液加入CCl4,CCl4层显紫色,证明原溶液中存在I
C.某溶液加入BaCl2溶液,产生不溶于稀硝酸的白色沉淀,该溶液一定含有Ag+
D.液溴易挥发,在存放液溴的试剂瓶中应加水封存
科目 化学   题型 选择题   难度 中等
知识点: 物质检验实验方案的设计
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