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  4. In lab H2O2 is prepared by

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Q. In lab $H_2O_2$ is prepared by

UP CPMTUP CPMT 2014Hydrogen

Solution:

In lab $H_2O_2$ is prepared by reaction of $BaO_2 \cdot 8H_2O$ and $H_2SO_4$(cold). A paste of $BaO_2 \cdot 8H_2O$ is prepared in ice-cold water and then added gradually to ice-cold dilute sulphuric acid.
$\underset{\text{ Barium peroxide}}{BaO_2 \cdot 8H_2O } + H_2SO_4 \to BaSO_{4} \downarrow +H_{2}O_{2} +8H_{2}O$
Barium sulphate precipitates out leaving behind a dilute solution of hydrogen peroxide.