Estimation of ozone can be made quantitatively by :

Options

A. decomposition into `O_(2)` and absorption of `O_(2)` into pyragallol
B. volumetric method using `Kl` and titration of the liberated iodine using hypo solution
C. oxidative ozonolysis method
D. all methods given above

Answer

B

Explanation

`2 KI + H_(2)O + O_(3) to 2KOH + O_(2) + I_(2)`
`2S_(2)O_(3)^(2-)+I_(2) to S_(4)O_(6)^(2-) + 2I^(-)`
1 mole of `O_(3)=` 1 mole of `I_(2)=` 2 mole of `S_(2)O_(3)^(2-)`