问题 问答题

图是某学校实验室从化学试剂商店买回的硫酸试剂标签上的部分内容.据此,下列说法正确的是 (  )

A.该硫酸的物质的量浓度为9.2mol•L-1

B.1molZn与足量的该硫酸反应产生2gH2

C.配制200mL4.6mol•L-1的稀硫酸需取该硫酸50mL

D.该硫酸与等体积的水混合后所得溶液的物质的量浓度等于9.2mol•L-1

答案

A、该硫酸的物质的量浓度为c=

1000ρw
M
=
1000×1.84×98%
98
=18.4(mol/L),故A错误;

B、浓硫酸与锌反应生成二氧化硫气体,不生成氢气,故B错误;

C、设配制200mL4.6mol•L-1的稀硫酸需取该硫酸的体积为xL,根据溶液稀释前后溶质的物质的量不变可知0.2L×4.6mol/L=x×18.4nol/L,x=

0.2L×4.6mol/L
18.4mol/L
=0.05L,即50ml,故C正确;

D、硫酸和水的密度不同,等体积混合后体积小于硫酸体积的2倍,混合后物质的量浓度大于平均值,故D错误.

故选C.

阅读理解

阅读理解。

     Mr Green worked in an office. He had no wife or children. And he lived in an old house alone. He

liked nothing but drinking. He almost spent all his money drinking. Sometimes he was hungry, and he had

to borrow some money from his friends to buy a little food. One evening he met a friend of his in the

street. The man asked him to have dinner in a restaurant. He was glad and drank a lot. When they left

there at midnight, he couldn't stand. The man had to stop a taxi and asked the driver to take him home.

Soon they got to the door of his house, with the help of the driver, he got out of the car.     "Thank you,

sir. " said Mr Green, "Now I can open the door myself. "     The taxi went away, but he couldn't put the

key into the keyhole. He was trying to do it when a policeman came.     "Can I help you put the key into

the keyhole, sir?"     "Thank you, sir," said Mr Green, "The house is circling now. If you can stop it now,

I can open the door myself. "

 根据短文内容,判断句子的正(T)误(F)。  

( )1. Mr Green liked drinking very much.                                            

( )2. Mr Green couldn't stand because he drank more than he could.                  

( )3. A friend asked Mr Green to have dinner because he was so hungry.              

( )4. The taxi driver sent Mr Green home and helped him out of the car.            

( )5. The house turned round and round, so Mr Green couldn't open the door himself .  

单项选择题