镍镉电池在通讯、交通及日常生活中有着广泛的应用,其工作原理可

镍镉电池在通讯、交通及日常生活中有着广泛的应用,其工作原理可以表示为:   

 以下说法中正确的是

A.以上反应是可逆反应             

B.放电时,镉为正极 

C.充电时电池上标有“+”号的电极连接电源负极

D.以镍镉电池为电源,电解Na2CO3溶液,当收集到气体的总体积为33.6L(标况下)时,电池中转移了2mol电子。

 

答案

D

解析:略

 

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