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【单选题】
检查砷盐时,与溴化汞反应形成有色砷斑的物质为( A )
A.
.砷化氢气体
B.
.硫化氢气体
C.
.亚砷酸盐(AsO33-)
D.
.砷酸盐(AsO43-)
E.
.汞离子(Hg2+)
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