问题 多选题

已知下述三个实验均能发生化学反应

将铁钉放入硫酸铜溶液中向硫酸亚铁溶液中滴入几滴浓硝酸将铜丝放入氯化铁溶液中
下列判断正确的是(  )

A.实验①中铁钉只做还原剂

B.上述实验证明Fe3+既显氧化性又显还原性

C.实验③中发生的是置换反应

D.上述实验证明氧化性:Fe3+>Cu2+>Fe2+

答案

A、由①中发生Fe+Cu2+═Fe2++Cu,Fe元素的化合价升高,则Fe作还原剂,故A正确;

B、因Fe3+中Fe元素的化合价只能降低,则只能表现氧化性,故B错误;

C、置换反应是单质与化合物反应生成新单质和新化合物,而③中发生Cu+2Fe3+═2Fe2++Cu2+,生成物中没有单质,则不是置换反应,故C错误;

D、由发生的三个反应,利用氧化剂的氧化性大于氧化产物的氧化性,则上述实验证明氧化性为Fe3+>Cu2+>Fe2+,故D正确;

故选AD.

阅读理解

After more than a year of bitter political debate, President Obama sat down in the White House East Room on March 23 and signed the 2010 Patient Protection and Affordable Care Act into law with a pen,and then another pen,and another. Obama used 22 pens to sign the $938 billion health care bill.

The practice of using different pens to sign important legislation(法规)dates at least as far back as Franklin Roosevelt. The reason is fairly simple. The pen used to sign historic legislation itself becomes a historical artifact. The more pens a President uses, the more thank-you gifts he can offer to those who helped create that piece of history. The White House often give pens to supporters of the newly signed legislation. When Lyndon Johnson signed the Civil Rights Act in 1964, he reportedly used more than 75 pens and gave one of the first ones to Martin Luther King Jr. And in 1996, President Clinton gave the four pens he used to sign the Line-Item Veto bill to those most likely to appreciate the bill's consequence.

Once they're given away, some pens end up in museums; others are displayed proudly in recipients'(接受者) offices or homes. But they sometimes appear again, like in the 2008 presidential campaign(竞选活动), when John Macain promised to use the same pen given to him by President Reagan to cut pork from the federal budget.

Not every President goes for the multipen signature, however. President George W. Bush preferred signing bills with only one pen and then offering several unused "gift" pens as souvenirs.

小题1:.We can learn from paragraph 1 that the 2010 Patient Protection and Affordable Care Act        .

A.has been passed easily

B.was put forward one year ago

C.becomes law in the USA

D.is unimportant小题2:How are the pens dealt with after being used by President Obama?

A.Supporters of the newly signed legislation are likely to get some of them.

B.Obama will keep them.

C.They will be just set aside

D.They will be sold to the public at a high price.小题3:What can we learn about John Macain?

A. He was ever President in the USA.

B. He took part in the 2008 presidential campaign.

C. He never used the pen given by Reagan.

D. He was only concerned about his own business.   

小题4:What does this passage mainly tell us ?

A. Obama signed the 2010 Patient Protection and Affordable Care Act.

B. It is a practice to use multiple pens to sign important legislation in the USA.

C. Pens are necessary in the signature.

D. All the presidents like the multipen signature.

单项选择题