题干

类推的思维方法在化学学习与研究中经常用到,但有时会产生错误的结论.因此,推出的结论最终要经过实践的检验才能决定其是否正确.以下几种类推结论中,正确的是(  )

A:第二周期元素氢化物的稳定性顺序是:HF>H2O>NH3;则第三周期元素氢化物的稳定性顺序也是:HCl>H2S>PH3

B:IVA族元素氢化物沸点顺序是:GeH4>SiH4>CH4;则VA族元素氢化物沸点顺序也是:AsH3>PH3>NH3

C:Fe3O4可以写成FeO3;Pb3O4也可以写成PbO•Pb2O3

D:NaHSO4与NaHSO3溶于水显酸性,由所有酸式盐溶于水显酸性

上一题 下一题 0.0难度 选择题 更新时间:2015-04-22 05:52:10

答案(点此获取答案解析)

A

同类题2

完形填空

    A long time ago there was a boy. He was smart, talented and handsome.  1, he was very selfish and his temper was so 2 that nobody wanted to be friends with him. Often he got angry and said various 3things to people around him.

    The boy's parents were very 4 about his bad temper. They considered what they could do and one day the father had an idea. He called his son and gave him a hammer and a bag of5.The father said: “Every time you get angry, take a nail and 6 it into that old fence as hard as you can.”

    The fence was very7and the hammer was heavy, nevertheless the boy was so angry that during the very first day he drove 37 nails.

    Day after day, week after week, the number of nails was gradually8. After some time, the boy started to understand that 9 his temper is easier than driving nails into the fence.

    One day the boy didn't 10 hammer and nails any more as he learned to hold his temper perfectly. So he came to his father and told about his11. “Now every time, when you hold your temper all day long,12 one nail”.

    Much time has passed. At last the boy could be13 of himself as all the nails were gone. When he came to his father and told about this, he14to come and take a careful look at the fence. “You did a good job, my son,15 pay your attention to the 16 that were left from the nails. The fence will 17 be the same. The same happens when you say hurtful things to people, as your words leave18 in their hearts like those holes in the fence. Remember, we need to 19 everyone with love and respect. It doesn't 20 that you say you are sorry, because the scars will not disappear.