下列实验用来证明SO2的存在,其中正确的是(    ) A.能使品红褪

下列实验用来证明SO2的存在,其中正确的是(    )

A.能使品红褪色,加热后又出现红色

B.能使湿润的蓝色石蕊试纸变红

C.通入足量的NaOH溶液中,再滴入BaCl2溶液有白色沉淀生成,该沉淀溶于稀盐酸

D.通入稀溴水中能使溴水褪色,得澄清溶液,再滴加Ba(NO3)2溶液有白色沉淀,该沉淀不溶于硝酸

答案

AD

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