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Q.

For obtaining 100% pure H2O2, the last traces of water are removed by

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a

distillation

b

heating on water both

c

distillation under reduced pressure

d

sudden cooling in freezing mixture of ether/solid CO2

answer is D.

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Detailed Solution

90% solution is cooled with solid CO2​+ ether bath. Cooling is continued till crystallization sets in. Crystals are separated, melted and refrozen for further concentration.
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