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Q.

A 5 mL solution of H2O2 liberates 0.508 g of Iodine from an acidified KI solution. What is the volume strength of the H2O2 solution ?

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a

2.2%

b

3.8%

c

4.48%

d

None of these

answer is C.

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Detailed Solution

Meq.  of  H2O2  =Meq.  of  I2   WH2O234×  2×1000=0.508254×2×1000   WH2O2  =  0.068  gH2O2     H2O  +  12O2   34  g  H2O2  gives  11.2  litres  of  O2  atSTP   0.068  g  gives  =  11.234  ×  0.068=22.4  ml  O25ml of H2O2(0.068g)22.4mi O21ml of H2O2               ?   Volume  Strength  of  H2O2=22.45=4.48  volume

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