問題詳情
10.银质器皿日久表面会逐渐变黑，这是生成了Ag2S的缘故.根据电化学原理可进行如下处理:在铝质容器中加入食盐溶液，再将变黑的银器漫入该溶液中，一段时间后发现黑色会褪去。下列说法正确的是
(A)处理过程中银器一直保持恒重
(B)银器为正极，Ag2S被还原生成单质银
(C)该过程中总反应为2Al + 3Ag2S = 6Ag + A12S3
(D)黑色褪去的原因是黑色Ag2S转化为白色AgCl
(A)处理过程中银器一直保持恒重
(B)银器为正极，Ag2S被还原生成单质银
(C)该过程中总反应为2Al + 3Ag2S = 6Ag + A12S3
(D)黑色褪去的原因是黑色Ag2S转化为白色AgCl
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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