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Hydrogen Peroxide

In Laboratory...

Question

In Laboratory, $H_{2} O_{2}$ is generally prepared by:

A

the action of

H_{2} S O_{4}

on barium oxide.

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B

the action of

H_{2} S O_{4}

on sodium peroxide.

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C

by the electrolysis of

H_{2} S O_{4}

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D

(a) and (b) above.

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Solution

The correct option is D (a) and (b) above.
Laboratory method: Hydrogen peroxide is prepared from barium peroxide.
By the action of dilute sulphuric acid. A paste of hydrated barium peroxide. $(B a O_{2} .8 H_{2} O)$ is prepared in ice – cold water and then added slowly to an ice-cold solution of $20 % H_{2} S O_{4}$
$B a O_{2} .8 H_{2} O + H_{2} S O_{4} \to B a S O_{4} ↓ + H_{2} O_{2} + 8 H_{2} O$

Prepared by Merck’s process: Adding calculated amounts of sodium peroxide to ice cold dilute (20%) solution of $H_{2} S O 4$
$N a_{2} O_{2} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O_{2}$

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