JEE Main 2023 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 8 April 2023, Shift 2, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

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

(1) $\mathrm{CF_2Cl_2}$ (g) $\xrightarrow{uv}$ $\dot{\mathrm{Cl}}$ (g) + $\dot{\mathrm{C}}\mathrm{F_2Cl}$ (g)
(2) $\dot{\mathrm{Cl}}$ (g) + $\mathrm{O_3}$ (g) $\longrightarrow$ $\mathrm{Cl}\dot{\mathrm{O}}$ (g) + $\mathrm{O_2}$ (g)
(3) $\mathrm{Cl}\dot{\mathrm{O}}$ (g) + O (g) $\longrightarrow$ $\dot{\mathrm{Cl}}$ (g) + $\mathrm{O_2}$ (g)
(4)2 $\mathrm{Cl}\dot{\mathrm{O}}$ $\longrightarrow$ $\mathrm{ClO_2}$ (g) + $\dot{\mathrm{Cl}}$ (g)Official answer

Official answer

Option 4

NTA final key.

Chapter: Environmental Chemistry
Topic: Environmental Chemistry
Idea tested: Ozone Layer Depletion

Same idea in other shifts

Asked 8× in all

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.