鉴别NaCl、NaBr、NaI可以选用的试剂是(    ) A.碘水、淀粉溶液     

鉴别NaCl、NaBr、NaI可以选用的试剂是(    )

A.碘水、淀粉溶液                        B.氯水、四氯化碳

C.溴水、汽油                              D.硝酸银溶液、稀硝酸

答案

解析:Br2水能将NaI分出来,但不能区分NaCl、NaBr。Cl2水氧化NaBr,NaI2加CCl4后溶液颜色分别为橙红和紫红,用AgNO3分别生成AgCl、AgBr、AgI依次为白、淡黄、黄色。

答案:BD

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