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13问答网 > 已知蓄电池在放电时起原电池的作用，充电时起电解池的作用．铅蓄电池在放电和充电时发生的化学反应可用下

已知蓄电池在放电时起原电池的作用，充电时起电解池的作用．铅蓄电池在放电和充电时发生的化学反应可用下

2025-03-16 09:54:23

推荐回答（1个）

回答1：

A、放电时，负极失去电子，则放电时铅蓄电池负极的电极反应为Pb+SO₄^2--2e^-=PbSO₄，故A错误；
B．充电时，负极与阴极相连，则阴极的电极反应为PbSO₄+2e^-=Pb+SO₄^2-，故B正确；
C、充电时，若要使1mol PbSO₄转变为Pb和PbO₂，根据充电时的反应方程式2PbSO₄+2H₂O=Pb+PbO₂+2H₂SO₄，可得1molPbSO₄反应时转移电子数1mol电子，故C错误；
D、放电时，电解质中的阳离子H⁺向正极移动，在正极得电子，故D错误．
故选B．

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