问题
选择题
某溶液中加入盐酸酸化的氯化钡溶液，无沉淀生成，当再加入硝酸钠时，有沉淀生成，则原溶液中可能含有的离子是
A．SO
B．S2－
C．CO
D．SO
答案
BD
先加盐酸后又加入NaNO3，相当于分步加了HNO3，它可将SO
氧化为SO
，与Ba2+形成沉淀，HNO3也可将S2－氧化为S沉淀。
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某溶液中加入盐酸酸化的氯化钡溶液，无沉淀生成，当再加入硝酸钠时，有沉淀生成，则原溶液中可能含有的离子是
A．SO
B．S2－
C．CO
D．SO
BD
先加盐酸后又加入NaNO3，相当于分步加了HNO3，它可将SO氧化为SO，与Ba2+形成沉淀，HNO3也可将S2－氧化为S沉淀。
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