下列实验不能达到预期目的是（ ）
①用硝酸钡溶液鉴别CO2和SO2 ②用如图装置吸收残余氨气
③用乙醇从碘水中萃取碘 ④用pH试纸测氯水的pH
⑤用加热方法提纯含碳酸氢钠的碳酸钠固体
⑥用铝和足量NaOH溶液充分反应，蒸干溶液制纯净NaAlO2
⑦用相互滴加的方法鉴别NaAlO2和NaHSO4溶液．
A．只有①③⑥
B．只有③④⑥
C．只有①②④⑤
D．只有②③④⑤⑥
答案：B
| 单句改错。 | |
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