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Which of the following solutions does not change its colour on passing ozone through it ?
A. Starch iodide solution
B. Alcoholic solidium of benzidine
C. Acidic solution of `FeSO_4`
D. Acidified solution of `K_2Cr_2O_7`

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Correct Answer - C
Ozone does not react with acidified solution of `K_2 Cr_2 O_7`.

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