(D) The peroxide ion is $O_2^{2-}$,which contains an $O-O$ single bond.Among the given options,$MgO$,$CaO$,and $Li_2O$ are normal oxides containing th

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(D) The peroxide ion is $O_2^{2-}$,which contains an $O-O$ single bond.Among the given options,$MgO$,$CaO$,and $Li_2O$ are normal oxides containing the $O^{2-}$ ion.$BaO_2$ is a peroxide of barium,which contains the $O_2^{2-}$ ion.Therefore,the peroxide bond is present in $BaO_2$.