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问题 选择题

FeS2的结构类似于Na2O2，是一种过硫化物，与酸反应生成H2S2，H2S2类似于H2O2易分解，实验室制取H2S时，某学生误将FeS2颗粒当作FeS使用，当FeS2和盐酸反应完全后，不可能生成的物质为

A．H2S

B．S

C．FeS

D．FeCl2

答案

答案：C

题目分析：由于FeS2与酸反应生成H2S2和FeCl2，H2S2易分解生成了H2S和S，故不可能生成FeS。

点评：本题解题技巧在于利用类比的思想，把FeS2的性质类似于Na2O2

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