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  4. Polar stratospheric clouds facilitate the formation of :

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Q. Polar stratospheric clouds facilitate the formation of :

JEE MainJEE Main 2022The p-Block Elements - Part2

Solution:

Polar stratospheric clouds provide surface on which hydrolysis of $ClONO _{2}$ takes place to form $HOCl$ (Hypochlorous acid)
$ClONO _{2}( g )+ H _{2} O ( g ) \rightarrow HOCl ( g )+ HNO _{3}( g )$