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Stoichiometry

Last molecule...

Question

Last molecule of $H_{2} O$ is evolved from $H_{2} O_{2}$ by:

crystallisation

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evaporation

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distillation under reduced pressure

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electrolysis

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Solution

The correct option is A crystallisation
The last molecule of water is separated from hydrogen peroxide by crystallization. $90 %$ solution of hydrogen peroxide is concentrated by cooling with solid carbon dioxide and ether bath. The crystals of hydrogen peroxide are separated, melted and refrozen.

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