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230问答网 > 现以铅蓄电池为外电源，以石墨作阳极、Pb作阴极，电解氯化铜溶液．反应原理如下：电池：Pb（s）+PbO2（s

现以铅蓄电池为外电源，以石墨作阳极、Pb作阴极，电解氯化铜溶液．反应原理如下：电池：Pb（s）+PbO2（s

2025-03-28 13:15:08

推荐回答（1个）

回答1：

A、原电池中，溶液中氢离子向正极二氧化铅电极移动，电解池中氢离子移向阴极Pb，故A错误；
B、原电池中Pb电极失电子发生氧化反应，电解池中PbO₂做阳极失电子发生氧化反应，Pb电极上硫酸铅得到电子发生还原反应，故B正确；
C、原电池放电负极Pb+SO₄^2--2e^-=PbSO₄，电解池中阳极上电极反应2Cl^--2e^-=Cl₂↑，Pb～Cl₂↑，毎消耗3mol Pb生成3molCl₂，故C错误；
D、原电池中铅作负极，负极上铅失电子和硫酸根离子反应生成难溶性的硫酸铅，所以质量增加，在电解池中，Pb阴极，阴极上氢离子得电子生成氢气，所以铅电极质量不变，故D错误；
故选B．

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