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Why is-ozone used for purifying air in c...

Why is-ozone used for purifying air in crowded places like cinema halls, underground railway stations, tunnels, slaughter houses?

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Bacteria and virus are easily destroyed by the strong oxidising nature of `O_(3)`. Ozone (an endothermic compound) easily decomposes to `O_(2) , 2O_(3)to3O_(2)` , which also destroys impurities and germs by oxidation. Hence, ozone is used for purifying air in crowded places.
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