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85问答库 > （理科必答）用石墨作电极电解CuCl2溶液时，从阳极上首先析出的物质是（　　）A．H2B．CuC．Cl2D．O

（理科必答）用石墨作电极电解CuCl2溶液时，从阳极上首先析出的物质是（　　）A．H2B．CuC．Cl2D．O

2025-04-08 11:10:52

推荐回答（1个）

回答1：

用石墨作电极电解CuCl₂溶液时，溶液中阳离子Cu²⁺、H⁺移向阴极，放电顺序为Cu²⁺＞H⁺；溶液中阴离子Cl^-、OH^-移向阳极，放电顺序为Cl^-＞OH^-，氯离子先失电子生成氯气，所以从阳极上首先析出的物质是氯气．
故选C．

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