已知:①在淀粉KI溶液中滴入少量NaClO溶液,并加入少量硫酸,溶液立即变蓝;②在上述蓝色溶液中,滴加过量的Na 2 SO 3 溶液,蓝色逐渐消失;③取实验②生成的溶液滴加BaCl 2 溶液有白色沉淀生成.下列判断正确的是( )
A.
上述实验证明氧化性:ClO - >I 2 >SO 4 2-
B.
上述实验③中的白色沉淀是BaSO 4 ,一定不含有BaSO 3
C.
实验①中硫酸的作用是氧化性和酸性
D.
实验②证明SO 3 2- 既有氧化性又有还原性
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