下列离子方程式书写错误的是_刷题宝

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下列离子方程式书写错误的是

A：氧化铝溶于强碱溶液中：3H₂O+Al₂O₃+2OH^－=2Al(OH)₄^－

B：在苯酚钠溶液中通入CO₂气体：2C₆H₅O^－+H₂O+CO₂→2C₆H₅OH+CO₃²^－

C：用惰性电极电解硫酸铜溶液：2Cu²⁺+2H₂O2Cu+O₂↑+4H^＋

D：在海带中提取碘元素时，在滤液中加入适量的稀硫酸和双氧水：2H^＋+2I^－+H₂O₂=I₂+2H₂O

上一题下一题 0.0难度选择题更新时间:2019-11-21 03:30:01

答案(点此获取答案解析）

B

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任务型阅读

When you are in England, you must be very careful in the street because the traffic drives on the left. Before you cross a street, you must look to the right first and then the left. If the traffic lights are red, the traffic must stop. ____ If the traffic lights are green, ____ The people on foot must not cross. In the morning and in the evening when people go to or come back from work, the streets are very busy.

____ Always remember the traffic moves on the left. So you must be careful. ____ In many English cities, there are big buses with two floors. You can sit on the second floor. From there you can see the city well. ____

A. the traffic can go.

B. There is no need for you to look around.

C. Have a look first or you will go the wrong way.

D. When you go by bus in England, you have to be careful, too.

E. It is very interesting.

F. The people on foot can cross the road carefully.

G. It is really strange.

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