在氯化钡溶液通入SO2,溶液仍澄清,若将氯化钡溶液分装两支试管,

在氯化钡溶液通入SO2,溶液仍澄清,若将氯化钡溶液分装两支试管,一支加硝酸,另一支加NaOH溶液,然后再通入SO2,结果两试管中都有白色沉淀生成,由此得出下列结论合理的是(    )

A.氯化钡有两性

B.两支试管中的白色沉淀都是BaSO4

C.SO2具有还原性和酸性

D.加碱后溶液中浓度增大

答案

CD

解析:加HNO3时,HNO3将H2SO3氧化成与Ba2+作用生成BaSO4沉淀;加NaOH时,H2SO3+2OH-2H2O+与Ba2+作用生成BaSO3沉淀。

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