题目内容

【题目】甲、乙、丙三溶液各含有一种X－(X－为Cl－、Br－或I－)，向甲中加入淀粉溶液和氯水，则溶液变为橙色，再加丙溶液，颜色无明显变化。则甲、乙、丙依次含有( )

A.Br－、I－、Cl－ B.Br－、Cl－、I－

C.I－、Br－、Cl－ D.Cl－、I－、Br－

【答案】A

【解析】[向甲中加入淀粉溶液和氯水，溶液变为橙色，应是溴水的颜色，则甲中必含有Br－，被Cl2置换生成了Br2，由此否定了C、D；再加丙溶液，颜色无明显变化，说明丙溶液中不含I－，否则加入后应被Br2所置换，生成I2，溶液应为蓝色，与题给条件不符，则丙溶液只能含有Cl－，I－必在乙溶液中。因此甲、乙、丙溶液依次含有Br－、I－、Cl－。]

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