下列关于化合价的判断正确的是(    ) A.Na2O中O元素为-1价    

下列关于化合价的判断正确的是(    )

A.Na2O中O元素为-1价                  B.Na2O2中O元素为-2价

C.SO2中O元素为-1价                    D.SO3中O元素为-2价

答案

D


解析:

过氧化钠中氧为-1价;氧化钠、二氧化硫和三氧化硫中氧均为-2价。

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