问题 选择题

下列说法正确的是

A.将FeCl3溶液加热蒸干,并灼烧最终得到Fe2O3

B.25oC时CH3COONa溶液的Kw大于100OC时CH3COONa溶液的Kw

C.100OC时,将PH=2的盐酸与PH=12的NaOH溶液等体积混合,溶液呈中性

D.一般而言,弱电解质的浓度越大,其电离度越小,电离常数也越小

答案

答案:A

氯化铁溶液中存在铁离子的水解平衡,加热促进水解,且氯化氢极易挥发,所以最终得到的是氢氧化铁,灼烧则得到氧化铁,A正确;水的电离是吸热的,所以升高温度,水的离子积常数增大,B不正确;100℃时水的离子积常数是1×1012,所以选项C中氢氧化钠是过量的,溶液显碱性;电离常数只与温度有关系,所以选项D不正确,答案选A。

阅读理解

A story from the Bible tells of old Babylon, where the men decided to build a tower that would touch the sky. But God was unhappy, and he made them speak different languages. They couldn’t understand each other, so their dream never came true.

Yet the dream remains alive: if all men speak the same language, they can do anything. L. L. Zamenhof from Poland was among the men who pursue this dream. He developed Esperanto(世界语)between 1877 and 1885.

As the most successful man-made world language, it is spoken by over two million people around the world. Last month, the World Esperanto Congress(大会), dealing with language rights, ended in Sweden. Most Esperanto speakers are in Central and Eastern Europe and in East Asia, particularly Chinese mainland.

Esperanto has two advantages. First, it’s easy. Each letter has exactly one sound and there are just 16 basic grammar rules. The second advantage is that it belongs to no one country. But Esperanto has only reached a small number of people compared with natural languages widely used around the world---such as English or Chinese. While these languages are deeply connected with their nations and cultures, Esperanto doesn’t have this background.

Will Esperanto really become a global language? It remains a question.

72.   The writer tells us a story at the beginning to___________.

A.explain why men have been making the effort to create a language shared by all

B.explain why men now speak different languages

C.show the relationship between man and God

D.prove that language is very important

73.   What does the underlined word “pursue” in the second paragraph mean?

A.“realize”.           B. “work for”.   C.“be against”.         D. “follow”.

74.   What is the basic difference between Esperanto and other natural languages?

A.More people speak English than Esperanto.

B.Esperanto words are easier to spell.

C.Esperanto has fewer grammar rules.

D.Esperanto is not supported by any country or culture.

75.   What does the story mainly talk about?

A.Advantages and disadvantages of Esperanto.

B.Man’s dream of sharing the same language has come true.

C.The most successfully planned language---Esperanto.

D.Comparison of Esperanto and other languages like English and Chinese.

单项选择题