2022英语周报高二外研学业水平考试专刊第1期答案

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10.DA.实验①中,0.1mol/LFe(SO1)3溶液加热前溶液为浅黄色,加热后颜色变深,说明升高温度水解程度增大,颜色加深,故Fe2(SO1)2溶液浅黄色的主要原因是Fe“水解产生了少量Fe(OH)3,A正确;B实验②中,酸化的0.1mol/LFe2(SO)2溶液加热前溶液接近无色,加热后溶液颜色无明显变化,说明温度升高几乎不能引起变化,则酸化对Fe+水解的影响大于温度的影响,B正确;C.实验③中,酸化的0.1mol/LFe2(SO4)2溶液加入NaCl后,溶液立即变为黄色,则氯离子影响平衡移动,加热后溶液颜色变深,则存在平衡:Fe+4C1+2H2O[FeC4(H2O2],C正确;D.实验④,加热前溶液为黄色,加热后溶液颜色变深,水解平衡移动或平衡Fe+4Cl-+2H2O=[FeCl4(H2O)2]移动均可使颜色变深,故不可证明升高温度,Fe2”水解平衡一定正向移动,D不正确。

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