Dioxides like PbO2 and MnO2 also consist of greater proportion of oxygen like peroxides and have related molecular formulae.????? ??????? ???? ?? ???? ????? ????? ??? ? ??????? ????????? ?? ????? ?? ?? ??????? ????.??? ?????? ??? ?? ?? ????? ??? ???? ????? ???? ? ????? ????? ?? ?? ??? ???? ???? ? ?????? ??? ?? ??? ???? ??????? ???.?? ???? ?????????