题干

下列表示正确的是     

A:电解饱和氯化镁溶液的离子方程式是2Cl-+2H2O H2↑+Cl2↑+2OH-

B:工业制硫酸过程中,沸腾炉里的反应方程式是2S+3O2 2SO3

C:泡沫灭火器的化学反应原理可表示为Al3++3HCO3-=Al(OH)3↓+3 CO2

D:表示硫酸与氢氧化钠溶液反应的中和热的热化学反应方程式是

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答案(点此获取答案解析)

C

同类题5

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

    It was a cloudy day, and the terrible experience happened when I was studying in Bangalore. I got a call from my mom that my brother's1was fixed and they were arranging the wedding ceremony in the next few days.My 2was pretty far. So the next thing I was 3 to do was to book my 4 ticket as there was no direct flight to my hometown. The 5 was done by an agent in my neighborhood. I paid the whole amount 6. But when the day approached the 7 disappeared, leaving me without the train ticket, and thus 8all my travel plan.

    But as it is said, once you face such 9 situations, you realize your inner strength. I 10 decided I would complete my whole journey by bus. Without further 11, I took a bus to the first city stop. The next bus was again not 12 —it was 8 hours to a city near my hometown, where my aunt lived. They were also going to 13 my brother's wedding ceremony. So I called them and 14 them to accommodate me. They 15. Half the battle was won.

    Then next day, I was just a few hours from my hometown. When my aunt's family and I were boarding our car, my 16 asked me to switch places with her.

    The journey continued. We were trying to overtake(超越) another car when 17 a truck appeared in front of us and we went directly head on in front of it. We 18 with the truck. In this accident, almost everyone in our car was 19. Fortunately, I didn't have any injury, 20my cousin who switched places with me was seriously injured!