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    【题目】下列关于硅酸的说法正确的是( )

    A．硅酸可以通过SiO2和水的化合反应制得

    B．用反应Na2SiO3＋2HCl===H2SiO3(胶体)＋2NaCl制取硅酸是利用了可溶性酸制难溶性酸的原理

    C．硅酸难溶于水，不能与NaOH溶液反应

    D．硅胶可用作袋装食品的干燥剂

    【答案】D

    【解析】SiO2不溶于水也不能与水反应生成硅酸，A项错误；B项中反应是利用了强酸制弱酸的原理，B项错误；硅酸虽难溶于水，但可与强碱溶液反应生成硅酸盐，C项错误。答案选D。

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