In the preparation of H(2)O(2), "MnO"(2...

In the preparation of `H_(2)O_(2)`, `"MnO"_(2)` or `"PbO"_(2)` cannot be used instead of `BaO_(2)` - why?

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`"BaO"_(2)` contains peroxo linkage (-O-O-), but `"MnO"_(2)` (O = Mn = O ) or `"PbO"_(2)` (O = Pb = O) does not contain peroxo linkage

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