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Question

If 10 ml of H2O2 solution requires 25 ml of N20KMnO4 for complete oxidation in acidic medium, then the mass (in g) of available O2 per litre present in the solution is:
  1. 2
  2. 1
  3. 4
  4. 3

A
4
B
1
C
2
D
3
Solution
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The oxidation reaction is as follows:
2KMnO4+5H2O2+4H2SO42KHSO4+2MnSO4+8H2O+5O2
Meq. of O2= Meq. of H2O2= Meq. of KMnO4
It is given that 10 ml of H2O2 solution when treated with 25 ml of N20 KMnO4 for complete oxidation.
N×10=25×120
Normality of H2O2=0.125N=Normality of O2
Weight of O2=0.125×32=4 g per litre.

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