JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Environmental Chemistry

Which of these reactions is not a part of breakdown of ozone in stratosphere?

(A) $Cl \dot{O} (g) + O (g) ⟶ Cl (g) + O_{2} (g)$
(B) $Cl ∙ (g) + O_{3} (g) ⟶ Cl \dot{O} (g) + O_{2} (g)$
(C) $2 Cl \dot{O} ⟶ ClO_{2} (g) + Cl (g)$ ✓ Correct
(D) $CF_{2} Cl_{2} (g) uv \dot{C} l (g) + \dot{C} F_{2} Cl (g)$

Answer: (C)

Solution

The depletion of stratospheric ozone begins with the photolysis of a chlorofluorocarbon to give chlorine atoms. A chlorine atom reacts with ozone to give a chlorine monoxide radical and oxygen, and the chlorine monoxide radical then reacts with an oxygen atom to regenerate the chlorine atom and form oxygen, completing the catalytic cycle. The combination of two chlorine monoxide radicals to give chlorine dioxide and a chlorine atom does not belong to this cycle, so that step is not part of the breakdown of ozone.

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Single correct option

Practise more: all JEE Main PYQs on Environmental Chemistry →

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Environmental Chemistry

Solution

More JEE Main questions on Environmental Chemistry