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【多选题】
关于法的叙述,错误的有A.
反应生成的砷化氢遇溴化汞，产生黄色至棕色的砷斑
B.
加碘化钾可使五价砷还原为三价砷
C.
与碱作用可生成新生态的氢
D.
加酸性氯化亚锡可防止五价碘离子还原为三价碘离子
E.
标准砷溶液应提前配置好，利于反应完全
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