题干

工业上常用空气中的氮气生产硝酸,其反应方程式如下:

①N2+3H2

_
2NH3②4NH3+5O2 _
4NO+6H2O

③2NO+O2═2NO2④3NO2+H2O═2HNO3+NO(NO难溶于水)

下列说法错误的是(   )

A:上述①②③④中反应前后均有元素化合价的变化

B:用H2O吸收NO2的过程中通入过量的O2可以提高硝酸的产量

C:反应②④都不属于四种基本反应类型中的任何一种,反应①③均属于化合反应

D:在密闭容器中,将46g NO2溶于64g H2O中形成HNO3溶液,其溶质的质量分数约为38.2%

上一题 下一题 0.0难度 选择题 更新时间:2019-04-19 01:11:32

答案(点此获取答案解析)

D

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、D)中,选出可以填入空白处的最佳选项。

    Smiling is the most desirable human behavior. We tend to overlook the power of smiling, 1 can work out many wonders and miracles.

    In my spare time in the State, I loved to take a walk around the small community where I lived.  2 I met on the way, they always gave me a friendly greeting accompanied with a nice smile as soon as our eyes had 3 . Spontaneously(本能地), I smiled back. This kind of smiling exchange represented the most  4 part of my jogging experience in the State.

    When it comes to doing business, my  5  is “I love to see my customers smile”. If a customer smiles when he sees you, it means he feels comfortable  6 with you. More importantly, it means he makes money. If he can make money, I get the business rolling.

    On a personal note, my daughter's giggle(傻笑) is just like  7  which warms my inside the same way  8  the sun warms my body. It can  9  away any clouds and unpleasant feelings.  10 I see her photo, her giggle  11  around my ears. The little reserved and controlled smile of my wife,  12 , reflects the beauty of a matured and well-learnt woman. It is so  13  in my eyes. It can sometimes really turn me on.

    Julia Robert's  14 is nothing but roaring like earthquake or volcano. It can overtake men and women alike. Americans may  15 in many other ways, but they all agree that Julia is America's sweetheart. Nobody can 16 her laughter plays a very good part in her acting. Once I tried some candy in a store, the owner asked me how sweet the candy is, I said sweeter than Julia Robert. Both of us  17 into a kind of Julia's laughter.

    Yes, laughter is something we can not do without. Otherwise, our life would be too gloomy.

    Smiling does not belong to human alone. Once I stayed at an American home  18  he had a little doggy by the name of Mini. Mini is a lovely pet. Every time we came home, she jumped up and down and insisted  19 giving me some lipping. When I held her gently and asked her to give me a little smile, she just  20  her mouth and half closed her eyes, looking like every inch of smiling. That left a deep impression on me.

    What I love Los Angles most is not only it is the place where it has sunshine most days in a year but also where most people smile!

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