One of the methods used for manufacturing of $H_{2} O_{2}$ involves the electrolysis of:

concentrated

H_{2} S O_{4}

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fused alkali

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50 %

H_{2} S O_{4}

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50 %

aq.

N a O H

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Solution

The correct option is D $50 %$ $H_{2} S O_{4}$
By acidification, using $50 % H_{2} S O_{4}$ of $B a O_{2}$ and removal of excess water by evaporation under reduced pressure, we can obtain hydrogen peroxide.

The reaction is: $H_{2} S O_{4} + B a O_{2} \to B a S O_{4} + H_{2} O_{2}$

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