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    【题目】下列物质在水中溶解度的顺序正确的是 ( )

    A．NH3＞HCl＞CO2＞SO2＞Cl2

    B．SO2＞CS2＞H2S>S8

    C．HOCH2(CHOH)4CHO＞C17H35COOH＞HCOOH

    D．HF＞CO2＞CH4

    【答案】D

    【解析】水为极性分子，与水形成氢键、与水反应的气体在水中溶解度大。二氧化碳是非极性分子，二氧化硫是极性分子，二氧化硫在水中的溶解度大于二氧化碳，A项错误；CS2是非极性分子，溶解度小于SO2、H2S，B项错误；HCOOH与水形成氢键，能与水混溶，同类有机物的相对分子质量越大，极性越弱，在水中的溶解度越小，C项错误；HF与水形成氢键，CH4和二氧化碳都是非极性分子，而二氧化碳与水反应，所以HF的溶解度最大，CH4最小，D项正确。

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