All titration which involves the direct titration of Iodine with a reducing agent are grouped under lodimetry. Iodimetry is employed to determine the strength of reducing agent such as sodium thio sulphate `I_(2) + 2Na_(2)S_(2)O_(3) rarr 2I^(-)+S_(4)O_(6)^(-)`
If iodine is liberated as a result of chemical reaction involving oxidation of an idodide ion by a strong oxidizing agent in neutral or acidic medium the liberated iodine is then titrated with reducing agent. This titration is called lodometry. Todometry is used to estimate the strength of oxidizing agent. For example the estimation of `Cu^(++)` with thiosulphate.
`Cu^(+ +) +I^(-) Cu_(2)I_(2)+I_(2) , I_(2) +S_(2)O_(3)^(-) rarrS_(4)O_(6)^(-) +I^(-)`
Starch used as indicator near the end point which form blue colour complex with `I_(3)^(-)` . The blue colour disappears when
10 mL of `H_2O_2` solution on treatment with KI and titration of liberated `I_2` required 10 mL of 1 N hypo . Thus `H_2O_2` is :

Options

A. 1 N
B. 5.6 volume
C. `17 gL^(-1)`
D. All are correct

Answer

D

Explanation

No. of milli equivalent of `H_(2)SO_(4)=`
No. of milli equivalents of hypo
`10xx N = 10 xx 1 , N = 1N`
Volume strength =` 5.6 xx N = 5.6 `
`N = W/(CrEW)xx1`
`W = N xx GEW = 1 xx 17 = 17 g `.lit