下列实验过程中产生的现象与对应的图形相符合的是(    )    

下列实验过程中产生的现象与对应的图形相符合的是(    )

             

答案

解析:NaHSO3粉末加入HNO3溶液中,被HNO3氧化成,不能产生SO2气体,A错;H2S气体通入氯水中,发生反应:H2S+Cl22HCl+S↓,生成的盐酸是强酸,pH应减小,B错;NaOH溶液滴入Ba(HCO3)2溶液中,立即产生BaCO3沉淀,C错;CO2通入澄清石灰水中,先生成CaCO3沉淀和水,溶液导电能力减弱,CO2过量,CaCO3转化成易溶于水的强电解质Ca(HCO32,溶液导电能力增强,D正确。

答案:D

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