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Saturday, 31 October

JEE Main · Chemistry · Environmental Chemistry

Ozone Layer Depletion

JEE Main asked Ozone Layer Depletion 8 times in 8 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2023. It belongs to Environmental Chemistry (Chemistry). The longest wait between two years asking it was 1 year. In 2021 and 2023 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
8
in 8 shifts
Years
4 of 8
First asked
2020
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.150.30’170.08’200.10’210.03’220.21’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 3 in 24 shifts · 2022: 1 in 24 shifts · 2023: 3 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20233 of 12
  • 20221 of 24
  • 20213 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: recall.

  • Identify step not in ozone depletion mechanism
  • False statement selection on ozone

Difficulty

Easy 6Medium 2Hard 0

Every question was multiple choice.

Every question

All 8 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 13 Apr 2023, Shift 1 · Q72The radical which mainly causes ozone depletion in the presence of UV radiations is :EasySingle correct
  2. 11 Apr 2023, Shift 2 · Q71Which of the following compounds is an example of Freon?EasySingle correct
  3. 8 Apr 2023, Shift 2 · Q70Which of these reactions is not a part of breakdown of ozone in stratosphere?MediumSingle correct
  4. 26 Jul 2022, Shift 1 · Q70C˙l+CH4→A+B\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
  5. 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
  6. 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
  7. 4 Aug 2021, Shift 1 · Q41In stratosphere, chlorofluorocarbon compounds break down by UV radiations, releasing 'X' free radical, which further causes ozone layer…EasySingle correct
  8. 2 Sep 2020, Shift 1 · Q38The statement that is not true about ozone is :EasySingle correct

Shifts: 2 Sep 2020, Shift 1, 25 Jul 2021, Shift 2, 4 Aug 2021, Shift 1, 27 Aug 2021, Shift 1, 26 Jul 2022, Shift 1, 8 Apr 2023, Shift 2, 11 Apr 2023, Shift 2, 13 Apr 2023, Shift 1.

Same topic

Other ideas in Environmental Chemistry

Environmental Chemistry has 19 ideas JEE Main has asked; 15 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisAll repeated ideas