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    【题目】下列各组溶液混合后，溶液显碱性的是( )

    A．10 mL 0.1 mol·L－1 NH3·H2O与10 mL 0.1 mol·L－1 HCl

    B．10 mL 0.1 mol·L－1 K2S与10 mL 0.1 mol·L－1 K2SO4

    C．10 mL 0.1 mol·L－1 KOH与10 mL 0.1 mol·L－1 KHCO3，再加入10 mL 0.1 mol·L－1 BaCl2

    D．10 mL 0.1 mol·L－1 NaOH与5 mL 0.1 mol·L－1 H2SO4

    【答案】B

    【解析】A项，正好完全反应，生成的NH4Cl水解显酸性；B项，K2S水解显碱性；C项，反应生成BaCO3沉淀、KCl和H2O，显中性；D项，恰好中和显中性。

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