JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 4 August 2021, Shift 1, Chemistry Q41

Question 41 of 90 in this shift, Chemistry question 11 of 30, Section A.

In stratosphere, chlorofluorocarbon compounds break down by UV radiations, releasing 'X' free radical, which further causes ozone layer depletion. Identify 'X'.

(1) $\mathrm{O_2^{\bullet -}}$
(2) $\mathrm{{}^{\bullet}Cl}$ Official answer
(3) $\mathrm{ClO^{\bullet}}$
(4) $\mathrm{{}^{\bullet}F}$

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 8× in all

8 Apr 2023, Shift 2 · Q70Which of these reactions is not a part of breakdown of ozone in stratosphere?MediumSingle correct
11 Apr 2023, Shift 2 · Q71Which of the following compounds is an example of Freon?EasySingle correct
13 Apr 2023, Shift 1 · Q72The radical which mainly causes ozone depletion in the presence of UV radiations is :EasySingle correct
26 Jul 2022, Shift 1 · Q70 $\dot{\mathrm{C}}\mathrm{l} + \mathrm{CH_4} \rightarrow \mathrm{A} + \mathrm{B}$ A and B in the above atmospheric reaction step are :EasySingle correct
27 Aug 2021, Shift 1 · Q41The gas ‘A’ is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in…EasySingle correctHas a figure
25 Jul 2021, Shift 2 · Q41Given below are two statements : Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release…MediumTwo statements
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 108 of the 174 JEE Main shifts held from 2017 to 2026.