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  4. The laboratory method for the preparation of H2O2 is by:

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Q. The laboratory method for the preparation of $H_{2}O_{2}$ is by:

Rajasthan PMTRajasthan PMT 2005

Solution:

In laboratory $H _{2} O _{2}$ is prepared as below by Merck's process
$Na _{2} O _{2}+ H _{2} SO _{4} \longrightarrow Na _{2} SO _{4}+ \underset{\text{Hydrogen peroxide}}{H _{2} O _{2}}$