试题与答案

有关电解水实验(如下图)的下列叙述,错误的是 A.试管甲中的气体是氢气 B.试

题型:选择题

题目:

有关电解水实验(如下图)的下列叙述,错误的是

A.试管甲中的气体是氢气

B.试管乙中的气体是氧气

C.该实验证明水由氢气和氧气组成

D.该实验证明水由氢元素和氧元素组成

答案:

答案:C

在通电的情况下2H2O===2H2↑+O2↑,氢气和氧气的体积比是2:1,所以,选项A、B正确,水是纯净物,不可能由氢气和氧气组成,C 错,D正确。

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