Last traces of water is removed from $H_{2} O_{2}$ by :

electrolysis

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crystallisation

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condensation

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evaporation

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Solution

The correct option is C crystallisation
$90 %$ solution is cooled with solid $C O_{2} +$ ether bath. Cooling is continued till crystallisation sets in. Crystals are separated, melted and refrozen for further concentration.

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