问题 多选题

下列反应的离子方程式正确的是(  )

A.过量SO2通入到Ba(NO32溶液中:3SO2+2NO3-+3Ba2++2H2O=3BaSO4↓+2NO+4H+

B.铝铵矾[NH4Al(SO42•12H2O]溶液中加入过量Ba(OH)2溶液:Al3++2SO42-+2Ba2++4OH-=AlO2-+2BaSO4↓+2H2O

C.H2O2溶液中滴加酸性KMnO4溶液:2MnO4-+5H2O2+6H+=2Mn2++5O2↑+8H2O

D.少量NaHSO4溶液与足量Ba(OH)2溶液反应离子方程式为:H++SO2-4+Ba2++OH-=BaSO4↓+H2O

答案

A、过量SO2通入到Ba(NO32溶液中,过量的二氧化硫生成亚硫酸会被氧化为硫酸,反应的离子方程式为:3SO2+Ba2++2NO3-+2H2O=BaSO4↓+4H++SO42-+2NO,故A错误;

B、铝铵矾[NH4Al(SO42•12H2O]溶液中加入过量Ba(OH)2溶液中铵根离子和氢氧根离子也可以结合形成弱电解质一水合氨,反应的离子方程式为

NH4++Al3++2SO42-+2Ba2++5OH-=AlO2-+2BaSO4↓+2H2O+NH3•H2O,故B错误;

C、H2O2溶液中滴加酸性KMnO4溶液,过氧化氢被氧化为氧气,高锰酸钾被还原为锰离子,依据电荷守恒和原子守恒书写配平的离子方程式为:2MnO4-+5H2O2+6H+=2Mn2++5O2↑+8H2O,故C正确;

D、少量NaHSO4溶液与足量Ba(OH)2溶液发生反应,硫酸氢钠全部反应,所以反应离子方程式为:H++SO42-+Ba2++OH-=BaSO4↓+H2O,故D正确;

故选CD.

阅读理解

阅读理解。

     Researchers in Britain are driving the environmental movement to a new level. A team from the University

of Warwick has built what it calls the world's first completely environmentally friendly Formula Three racing

car.

     The car is made mainly of renewable materials, like plants and vegetables. The structure around the car is

made from natural plant fibers and potatoes. The steering wheel (方向盘) is made from root vegetables like

carrots. The engine uses bio-fuel made from vegetable oil and waste chocolate.

     The new racing car is extremely fast. The car has a top speed of two hundred fifteen kilometers an hour.

And it can go from zero to ninety-five kilometers an hour in just two and a half seconds. The racing car meets

all of the Formula Three racing requirements except for its biodiesel (生物柴油) engine.

     Automobile racing is one of the most widely watched sports in the world. But it is also considered one of

the least friendly sports to the environment. Racing cars burn a lot of fuel, and create a lot of air pollution. In

recent years, the racing industry has taken steps to protect the environment. More racing companies are now

producing cars that use less energy. These cars produce less pollution than cars that depend on traditional fuel,

like gasoline.

     Last month, the new racing car was set to run in its first competitive race at the Formula Three

Championship Final at Brands Hatch. It would have been the first biodiesel-powered car to race at Formula

Three. Current Formula Three rules let only gasoline-powered car to compete. Officials needed permission

from all of the Formula Three racers for the biodiesel-powered car to compete. They were unable to contact

one of the drivers, so the new racing car didn't appear in the event. In test runs, the new racing car was the

fifth fastest among the Formula Three race cars. Supporters are hoping to have the fuel problem solved in time

to compete in the next season.

1. What's the second paragraph mainly about?

A. What materials the new racing car is made of.

B. Why researchers built the new racing car.

C. The characteristics of the new racing car.

D. The process of the new racing car being designed.

2. According to the passage, the of the new racing car doesn't meet the Formula Three racing requirements.

A. speed

B. appearance

C. weight

D. engine

3. It can be inferred from the passage that _____.

A. the new racing car is the first environmentally friendly car

B. automobile racing could be forbidden in the near future

C. many people like to watch automobile racing

D. the new racing car will be allowed to compete in the next season of Formula Three racing

4. In recent years, racing companies are producing cars that _____.

A. burn more fuel

B. go more quickly

C. produce less pollution

D. cost less money

5. Why didn't the new racing car compete at the Formula Three Championship Final last month?

A. Because the new racing car still needs testing.

B. Because officials needed each racer's permission but failed to contact one.

C. Because there're some technical problems to be solved.

D. Because few drivers think it is fast enough.

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