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In lab `H_(2)O_(2)` is prepared by
A. cod dilute `H_(2)SO_(4)` on hydrated `BaO_(2)`
B. dil. HCl on `MnO_(2)`
C. cold` H_(2)SO_(4)` on `MnO_(2)`
D. aqueous alkali on `Na_(2)O_(2)`

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`BaO_(2).8H_(2)O+H_(2)SO_(4)rarrBaSO_(4)+H_(2)O_(2)+8H_(2)O`

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