A `5.0 cm^(3)` solution of `H_(2)O_(2)` liberates `1.27 g` of iodine from an acidified `KI` solution. The precentage strength of `H_(2)O_(2)` is

Options

A. `11.2`
B. `5.6`
C. `1.7`
D. `3.4`

Answer

D

Explanation

`H_(2)O_(2)=KI=I_(2)`
mEq of `H_(2)O_(2)=5xxN`
mEq of `I_(2)=("Weight")/(EW)xx1000`
`=1.27/127xx1000=10 mEq`
`I_(2)=MW=254/2=127`
`:.` mEq of `I_(2)`
`5xxN=10 :. N=2`
`1N` of `H_(2)O_(2)=1.7%` of `H_(2)O_(2)`
`2N` of `H_(2)O_(2)=3.4% H_(2)O_(2)`