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Question

H2O2 is used as bleaching reagent because on dissociation it gives oxygen as follows:
H2O2H2O+12O2
If "Chachi 420" used H2O2 solution to bleach her hair and she required 2.24LO2 gas at 1 atm and 273K. She has a H2O2 solution labeled as 5.6V then what volume of such solution must she required to bleach her hair?

A
200ml
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B
300ml
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C
400ml
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D
500ml
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Solution

The correct option is C 400ml
5.6 volume H2O2 means 1L of solution gives 5.6 L gas O2
Therefore 2.24L gas O2 would be obtained from (15.6×2.24)=0.4L or 400 ml of solution.

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