问题 问答题

选用提供的试剂设计实验验证炉渣(主要成分是Fe2O3)中含有FeO.提供的试剂如下:稀盐酸、稀硫酸、KSCN溶液、KMnO4溶液、NaOH溶液、碘水.所选用的试剂为______,证明炉渣中含有FeO的实验现象是______.

答案

若Fe2O3中含有FeO,利用稀酸(非氧化性)溶解后生成的亚铁离子,则具有还原性,而给出的试剂中KMnO4溶液具有强氧化性,可使KMnO4溶液褪色,

则选择试剂为稀硫酸、KMnO4溶液,

操作为取少量固体溶于稀硫酸,然后滴加KMnO4溶液,观察到溶液使KMnO4溶液褪色,

则证明含有FeO,

故答案为:稀硫酸、KMnO4溶液;稀硫酸浸取炉渣所得溶液使KMnO4溶液褪色.

阅读理解

Buying a house for most of the people is a once in a lifetime decision, which means people decide to do so only after coming across the ideal house. Surprisingly, eight in every 10 home buyers are unhappy with their houses.

A survey conducted by the Beijing Consumers’ Association (BCA) recently shows about 80 percent of the 2,315 respondents in 23 residential complexes of Beijing are dissatisfied with the soaring house prices.

They think the reasonable price in Beijing should be between 3,000 yuan and 7,000 yuan per square meter.

The quality of the buildings, the surrounding environment and traffic and property management(物业管理)are the other factors that play a role in people’s decision to buy a house.

The BCA has suggested strict sales regulations and contracts to ease house-owners’ sufferings. It has urged the authorities to impose severe punishment on developers found violating building and other rules and joining hands with others to bid up property prices, About 41.2 percent of the respondents have complained that their house have defective designs, while nearly 40 percent say the lighting and ventilation(通风)are far from satisfactory.

The landscapes in the residential areas are a source of unhappiness for 43.2 percent of the respondents, and about one-third say they were “bluffed” into buying “third grade” house. And more than half are not satisfied with the sport and entertainment facilities in their neighborhood.

Property management in the buildings, 56.5 percent of the respondents say, is way below standard compared to the high fee charged by the complexes.

60 percent of the consumers doubt the contents of developers’ advertisements, with only 6.3 percent being satisfied.

Experts have suggested consumers gather thorough knowledge about a developer and their work before deciding to buy a house from it. They should check the day-light conditions and ventilation in different weather conditions in advance, if possible.

小题1: According to the passage________ of the buyers are NOT content with their houses.

A.80%

B.60%

C.56.5 %

D.41.2%小题2:Which is the best title of the passage?

A.Most Home Buyers Are Unhappy with Their House.

B.Buying a House Is an Important Decision.

C.Thinking Carefully Before Buying a House.

D.The Environment Is Important When Making a Decision.小题3:The meaning of the underlined word probably means “_______”.

A.fooled

B.cheated

C.asked

D.forced小题4:If you want to buy a flat, according to the survey, you will consider the following EXCEPT_______.

A.property management

B.the surrounding environment

C.the quality of the buildings

D.the height of the building

单项选择题