When KI in acidic medium were mixed in 50ml `H_2O_2` liberated `I_2` requires 20ml of 0.1N hypo. What is strength of `H_2O_2`.

Options

A. 6.8 g/litre
B. 0.68 g/litre
C. 680 g/litre
D. 68.0 g/litre

Answer

B

Explanation

No of milli equivalents of `H_2O_2` = No of milli equivalents of hypo
No of milli equivalents of `H_(2)O_(2)= 20 xx 0.1= 2`
No of milli moles of `H_2O_2=1`
`:.` 1Lof `H_2 O_2` contain `1000/50 =20` millimoles
`:.` strength = `20 xx 34 xx 10^(-3)` g
= 0.68 g/L