题干

下列根据实验操作和现象得出结论不正确的是(    )

编号

实验操作

实验现象

解释与结论

A

向浓度均为0.1 mol·L-1NaCl和NaI混合溶液中滴加少量AgNO3溶液

出现黄色沉淀

Ksp(AgCl)>Ksp(AgI)

B

硝酸银溶液中加足量的NaCl溶液,再加KI溶液

先得到白色沉淀后变为黄色沉淀

Ksp(AgCl)>Ksp(AgI)

C

等体积pH=3的HA和HB两种酸分别与足量的锌反应,排水法收集气体

相同时间内,HA收集到的氢气多

HA是弱酸

D

用洁净的铂丝蘸待测液进行焰色反应

火焰呈黄色

溶液中含Na+,不含K+

A:A

B:B

C:C

D:D

上一题 下一题 0.0难度 选择题 更新时间:2019-08-24 08:44:39

答案(点此获取答案解析)

D

同类题1

写作题

    Chen Yifan, the student from a local senior high school, hit a BMW car parking along the street when he was passing by on a bicycle on February 4, leaving the rearview mirror broken and several scratches over the body of the car.

    Chen left a letter of apology to the car owner, together with an envelope of 311 yuan he had earned from part-time jobs during the winter holiday. He put them at the inside of a door handle.

    The car owner surnamed Xue found the letter and cash the next day and got so touched by Chen's honesty. With the help of local police Xue located the student on February 10 in the hope of returning the money. He told the police that he also wants to fund Chen's education if the family cannot afford it.

    On February 11, Chen's mother, after knowing what her son had done, voluntarily contacted Xue trying to compensate for the repair of 13,000 yuan. But Xue turned her down firmly.

    The next day, Xue's daughter visited Chen's family with a grant of 10,000 yuan for his education.

【写作内容】

1)用约30个单词写出上文概要;

2)用约120个单词发表你的观点,内容包括:

⑴如果你是那位中学生,你会怎么做?你又如何看待这位车主的行为?

⑵如何理解“穷有信、富而仁”这句话?

【写作要求】

1)写作过程中不能直接引用原文语句;

2)作文中不能出现真实姓名和学校名称;

3)不必写标题。

【评分标准】

内容完整,语言规范,语篇连贯,词数适当。