JEE Advanced Chemistry question

Estimation of ozone can be made quantitatively by

(A)Decomposition into O2 and absorption of O2 into pyrogallol
(B)Volumetric method using KI and titration of the liberated iodine using hypo solutionCorrect
(C)Oxidative ozonolysis method
(D)All methods given above

Answer: (B)

Solution

The standard quantitative method for estimating ozone is iodometric: ozone oxidises iodide in neutral/acidic KI solution, liberating an equivalent amount of iodine (O3 + 2KI + H2O → I2 + 2KOH + O2), and

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Question ID VK-159467