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    【题目】相同物质的量浓度的NaCN和NaClO相比，NaCN溶液的pH较大，则同温同体积同浓度的HCN和HClO说法正确的是( )

    A．电离程度：HCN>HClO

    B．pH：HClO>HCN

    C．与NaOH溶液恰好完全反应时，消耗NaOH的物质的量：HClO>HCN

    D．酸根离子浓度：c(CN－)<c(ClO－)

    【答案】D

    【解析】NaCN和NaClO都为强碱弱酸盐，相同物质的量浓度时NaCN溶液的pH较大，说明CN－水解的程度大，因此HCN比HClO的酸性更弱，电离程度：HCN<HClO，A项错误。pH：HClO<HCN，B项错误。由于都是一元酸，与NaOH完全反应时，HClO和HCN消耗NaOH的物质的量相同，C项错误。同浓度的HCN和HClO，酸性HCN<HClO，c(CN－)<c(ClO－)，D项正确。

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