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Friday, 9 October

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. (1)CF2Cl2\mathrm{CF_2Cl_2} (g) →uv\xrightarrow{uv} Cl˙\dot{\mathrm{Cl}} (g) + C˙F2Cl\dot{\mathrm{C}}\mathrm{F_2Cl} (g)
  2. (2)Cl˙\dot{\mathrm{Cl}} (g) + O3\mathrm{O_3} (g) ⟶\longrightarrow ClO˙\mathrm{Cl}\dot{\mathrm{O}} (g) + O2\mathrm{O_2} (g)
  3. (3)ClO˙\mathrm{Cl}\dot{\mathrm{O}} (g) + O (g) ⟶\longrightarrow Cl˙\dot{\mathrm{Cl}} (g) + O2\mathrm{O_2} (g)
  4. (4)2 ClO˙\mathrm{Cl}\dot{\mathrm{O}} ⟶\longrightarrow ClO2\mathrm{ClO_2} (g) + Cl˙\dot{\mathrm{Cl}} (g)Official answer

Official answer

Option 4

NTA final key.

Same idea in other shifts

Asked 2× in all
  1. 2 Sep 2020, Shift 1 · Q38The statement that is not true about ozone is :EasySingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.