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Question

Last molecule of H2O is evolved from H2O2 by:

A
crystallisation
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B
evaporation
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C
distillation under reduced pressure
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D
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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