问题 选择题

如图所示,烧杯内装有蒸馏水,下部封有半透膜的长颈漏斗内装有淀粉和食盐溶液,漏斗颈内的液面与烧杯内蒸馏水的液面相同。过一段时间后,用碘水和硝酸银溶液分别检测蒸馏水中的物质。整个实验过程中所观察到的现象是

①漏斗颈内的液面下降 ②漏斗颈内的液面上升 ③烧杯内的液体遇硝酸银溶液有白色沉淀生成 ④烧杯内的液体遇碘水变蓝

[ ]

A.①②

B.②③

C.③④

D.①⑤

答案

答案:B

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