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  4. Ozone when reacts with potassium iodide solution liberates certain product, which turns starch paper blue. The liberated substance is

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Q. Ozone when reacts with potassium iodide solution liberates certain product, which turns starch paper blue. The liberated substance is

ManipalManipal 2019

Solution:

$O _{3}$ (Ozone) works as oxidising agent. It reacts with potassium iodide ( $KI$ ) solution and liberate iodine vapours that turns starch paper blue.
$O _{3} \rightarrow O _{2}+ O$
$\frac{2 KI + H _{2} O + O \rightarrow 2 KOH + I _{2}}{2 KI + H _{2} O + O \rightarrow 2 KOH + I _{2}}$