题干

有关CuSO4制备途径及性质如图所示.

已知:

①Cu+2H2SO4(浓)

_
 CuSO4+SO2↑+2H2O.

②在一个化学反应中,如果有元素化合价升高,同时就有元素化合价降低.下列说法不正确的是(   )

A:途径②比途径①更好地体现绿色化学思想

B:生成等质量的硫酸铜,途径①中消耗硫酸的质量多

C:反应③分解所得混合气体X的成分是SO2和SO3

D:固体Y为CuO

上一题 下一题 0.0难度 选择题 更新时间:2018-02-23 07:37:08

答案(点此获取答案解析)

C

同类题5

阅读下面短文,掌握其大意,然后从各题所给的四个选项(A,B,C和D)中,选出最佳选项。

    Flora was a carnivorous(食肉的) plant. She lived in a supermarket, next to her friend, Porky, who worked there. Porky 1her with great affection and attention, and always gave her some meat at the end of each day. But one day, Porky didn't give her meat any more. Flora got so worried that she decided to 2 why Porky did this to her.

    After several days, she found out that Porky 3 lots of meat in a big yellow box. 4 not to know anything about it, Flora asked Porky if she could have a little of the food that was 5 in the yellow box. He responded very 6that she could not.

    Flora felt hurt, as well as 7, and she couldn't stop 8who Porky was keeping all that delicious-looking meat for. She was filling up with anger. That night, when the shop was 9, she went over to the box, opened it, and10the meat.

    The next morning, Porky arrived and found the meat had gone. Flora felt terrible. He asked her several times 11she had taken the meat. At first she 12it, but seeing Porky's worried face, she13 to admit to it.

    “What have you done?” Porky 14. “I told you not to touch it! All that meat was 15!That's why I haven't been able to give you 16for days. They sent us a spoiled(变质的)delivery.”

    Without delay, Flora was taken to a hospital, and the doctors there 17 to save Flora's life. Flora was very 18 and it taught her a big lesson. She learnt to stick to the 19set by those who loved her, because that was much 20. than doing whatever she wanted.

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