Barium peroxide (BaO2) as we can get from its name, has a per-oxy linkage in it. Due to which its treatment with H2SO4 gives H2O2 . Whereas, the other oxides don’t have the per-oxy linkage due to which hydrogen peroxide cannot be produced.
Whereas, all the other oxides give only water instead of hydrogen peroxide due to the absence of the per-oxy linkage in them.
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