问题 选择题

如图所示,向一定量的铁粉中加入一定体积12mol/L的HNO3,加热充分反应后,下列粒子在体系中一定大量存在的是(  )

①NO3- ②Fe3+ ③H+ ④NO ⑤NO2

A.①

B.①⑤

C.②④⑤

D.①②③⑤

答案

随反应的进行,硝酸浓度会变低,铁与稀硝酸反应生成NO,硝酸过量时生成三价铁,铁过量时,生成亚铁离子,

若铁粉过量,体系中大量存在NO3-、Fe2+、H+、NO;

若HNO3过量,体系中大量存在NO3-、Fe3+、H+、NO,

故选:B;

阅读理解

第三部分:阅读理解(共20小题,每小题2分,满分40分)

阅读下列短文,从每题所给的A、B、C和D四个选项中选出最佳选项。

Blue is the most attractive eye colour according to a new research.

Blue eyes like those belonging to sexy star Angelina Jolie are the most appealing colour according to a poll of 3,000 18-24 year olds by Fresh Look One Day Colour. Angelina, her partner Brad Pitt and his ex-wife Jennifer Aniston all have blue eyes and have all been named in a top twenty of the world's most desirable eyes.

The survey found that young folk with blue eyes are generally seen as being more sexy and kind.

And when asked if they would change the colour of their eyes if they could, only one in ten blue-eyed people wanted to, significantly less than people with other colour eyes.

One in three people who didn't have blue eyes wanted a change.

One quarter of respondents have considered wearing coloured contact lenses(隐形眼镜) to change their eye colour temporarily --- and blue is most wanted colour.

Green was the second most popular colour for those wanting a new look, with respondents saying green-eyed people were usually mysterious and creative.

People with brown or hazel eyes were perceived to be more trustworthy than people with other eye colours.

People with grey eyes were generally thought to be more intelligent than other people, and they were also described as usually being shy.

Blue was the most common eye colour among respondents, with 41 per cent of those who answered the survey having baby blue peepers and 39 per cent having brown or hazel eyes.

The survey also found that 18 per cent of people don't know what colour eyes their partner has!

1. Which of the following stars doesn’t have blue eyes?

A. Angelina Jolie       B. Jennifer Aniston      C. Brad Pitt     D. Audrey Hepburn

2. According to the study result, if you were a manager and wanted to find a most reliable person, you’d better hire one who has _________ eyes.

A. blue    B. green    C. brown     D. grey

3. According to the passage, which of the following statements is TRUE?

A. All people don’t know what colour eyes their partner has.

B. About 30% people without blue eyes don’t want a change.

C. Blue eyes are considered as the best eyes in the world.

D. People with grey eyes are thought to be less clever.

4. The underlined word “peepers” in the passage could be replaced by ______.

A. babies     B. colours    C. eyes       D. respondents

5. Which of the following is the best title of the passage?

A. Different eye colours in the world          B. A survey result on eye colours

C. Blue--- the most attractive eye colour       D. My favourite eye colour

单项选择题