First slide

Hydrogen Peroxide

Question

1% $H_{2} O_{2}$ obtained is extracted with water. The steps involved in its concentration are given below.
I) Evaporation under reduced pressure
II) Distillation under reduced pressure
III) Freezing
The proper sequence of above steps is

Moderate

A

I, II, III
B

II, I , III
C

I, III, II
D

II, III, I

Solution

After I – 30% $H_{2} O_{2}$ is obtained
After II – 85% $H_{2} O_{2}$ is obtained
After III – needle shaped crystals of pure $H_{2} O_{2}$ are obtained

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