Give mechanism of the following reactions:
(a) In lead chamber process, $N O (g)$ is used as a catalyst in the oxidation of $S O_{2}$ to $S O_{3}$ .
(b) $N O (g)$ catalyses the decomposition of ozone to oxygen.
(c) Ozone layer depletion by freon or Teflon.

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Solution

(a) In lead chamber process, $N O (g)$ is used as a catalyst in oxidation of $S O_{2}$ to $S O_{3}$ .
$2 S O_{2} (g) + O_{2} (g) N O (g) ⇋ 2 S O_{3} (g)$
(b) $N O (g)$ catalyses the decomposition of ozone to oxygen.
$O_{3} ⟶ O + O_{2}$
$N O + O_{3} ⟶ N O_{2} + O_{2}$
$2 O_{3} + N O ⟶ O + 2 O_{2} + N O_{2}$
(c) Freons are stable, non-flammable, moderately toxic gases or liquids which have typically been used as refrigerants and as an aerosol propellants.
Some of the examples are- $C F C l_{3}, C F_{2} C l_{2}$ , etc..
When these are released into the atmosphere they slowly move into the upper layers of the Earth's atmosphere where the ozone cloud is located. Here, the $C l$ atoms from the halogenated carbons get liberated and react with ozone converting it into oxygen. This is how ozone is getting depleted.

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