问题 选择题

已知AgI为黄色沉淀,AgCl为白色沉淀。25℃时,AgI饱和溶液中c(Ag+)为1.22×10-8 mol/L,AgCl饱和溶液中c(Ag+)为1.30×10-5 mol/L若在5 mL含有KCl和KI浓度均为0.01 mol/L的混合溶液中,滴加8mL0. 01 mol/L的AgNO3溶液,则下列叙述中不正确的是 [ ]

A. 溶液中所含溶质的离子浓度大小关系为:c(K+)>c(NO3-)>c(Cl-)>c(Ag+)>c(I-)

B. 溶液中先产生的是AgI沉淀

C. AgCl的Ksp的数值为1.69×10-10

D. 若在AgI悬浊液中滴加少量的KCl溶液,黄色沉淀不会转变成白色沉淀

答案

答案:A

阅读理解

阅读理解。

     A man once had a dream about the Black Forest in Germany. In his dream he was walking in the forest

when two men ran out and tried to throw him to the ground. He ran off as fast as he could, but they followed

him. He reached a place where he saw two roads in front of him, one to the right and the other to the left.

Which road should he take? He heard the two men behind him, getting nearer, and at the same time he heard

a voice in his ear. It told him to go to the right, and he did so. He ran on and soon came to a small hotel. He

was received there kindly and given a room, and he was saved from the two men. That was the dream.

     Twenty years later he was really in the Black Forest and as happened in the dream long ago, two men ran

out and tried to throw him down. He ran off, and came to a place with two roads, like in the dream. He

remembered the dream and took the road to the right He soon reached a small hotel, was taken in, and so

was safe. His dream of twenty years before had saved his life.

1. The Black Forest is ________.

A. a place in Germany

B. not a real place

C. invented by the writer

2. When he was walking in the forest, ________ ran after him.

A. two dogs

B. two tigers

C. two men

3. Finally he came to ________.

A. a forest

B. a small hotel

C. another dream

4. It was ________ that saved the man's life 20 years later.

A. a voice

B. the dream

C. someone else

5. The story tells us that ________.

A. a dream may come true sometime

B. people should not believe their dreams

C. dream can save one's life

单项选择题