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In lab $\mathrm{H}_2 \mathrm{O}_2$ is prepared by
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Cold $\mathrm{H}_2 \mathrm{SO}_4+\mathrm{BaO}_2$
$\mathrm{H}_2 \mathrm{SO}_4+\mathrm{BaO}_2 \rightarrow \mathrm{BaSO}_4+\mathrm{H}_2 \mathrm{O}_2$
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