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1994年高考(老科目组)第9题是这样的:下列反应适用于实验室制氢气的是( )。 ①锌和稀硫酸反应;②甲烷热分解;③电解稀硫酸;④赤热的炭与水蒸气反应。 A.只有① B.①、② C.①、③ D.①、②、④ 这道题是很容易的,正确答案是C。但绝大多数考生选了A,主要是对③这一实验制H_2的可操作性不能判断,也就是不能把旧知识电解稀硫酸升华用在制H_2上。那么造成这一结
The 9th item of the 1994 college entrance examination (old subjects group) was like this: The following reaction applies to hydrogen produced in the laboratory (). 1 zinc and dilute sulfuric acid reaction; 2 methane thermal decomposition; 3 electrolytic dilute sulfuric acid; 4 red hot carbon and steam reaction. A. Only 1 B.1, 2 C.1, 3 D.1, 2, 4 This question is very easy, the correct answer is C. However, the vast majority of candidates chose A, mainly because of the operability of the experiment system H2, which cannot be judged. That is, the old knowledge cannot be sublimated and used for H_2. Then cause this knot