把Ba(OH)2溶液滴入明矾溶液中,使SO42-全部转化成BaSO4沉淀,此时铝元

把Ba(OH)2溶液滴入明矾溶液中,使SO42-全部转化成BaSO4沉淀,此时铝元素的主要存在形式是                                                                 (    )

A.AlO2                B.Al(OH)3           C.Al3+          D.Al3+和Al(OH)3

 

答案

A

解析:

 

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