试题与答案

某溶液中含有两种溶质NaCl和H2SO4，它们的物质的量之比为3:1。滴入几滴石

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题型：选择题

题目：

某溶液中含有两种溶质NaCl和H2SO4，它们的物质的量之比为3:1。滴入几滴石蕊溶液后，用石墨作电极电解该混合溶液，根据电极产物，电解过程可明显分为三个阶段。下列叙述中不正确的是 [ ]

A．阴极自始至终只产生H2

B．电解过程中，溶液颜色呈现红色→紫色→蓝色的变化

C．电解过程中，Na+和SO42-的物质单的量浓度保持不变

D．第一阶段中阴、阳两级产生的气体混合引燃后，恰好完全反应得到HCl

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C解析：相当于少数的原因引起多数问题。

考点：电解池原理
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