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Saturday, 31 October

JEE Main · Chemistry · Environmental Chemistry

Classical vs Photochemical Smog

JEE Main asked Classical vs Photochemical Smog 7 times in 7 of the 108 shifts Lumi analysed, in 2021, 2022 and 2023. It belongs to Environmental Chemistry (Chemistry). The longest wait between two years asking it was 1 year. In 2021 and 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
7
in 7 shifts
Years
3 of 8
First asked
2021
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

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

00.050.10’170’200.10’210.10’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 3 in 24 shifts · 2022: 3 in 24 shifts · 2023: 1 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
  • 20231 of 12
  • 20223 of 24
  • 20213 of 24
  • 20200 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: conceptual.

  • Conditions favouring photochemical smog
  • Odd-one-out among smog components

Difficulty

Easy 6Medium 1Hard 0

Every question was multiple choice.

Every question

All 7 questions

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

  1. 6 Apr 2023, Shift 1 · Q71The possibility of photochemical smog formation is more atEasySingle correct
  2. 28 Jun 2022, Shift 2 · Q72Correct statement about photo-chemical smog is :EasySingle correct
  3. 27 Jun 2022, Shift 1 · Q72Given below are two Statements : Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and…EasyTwo statements
  4. 25 Jul 2022, Shift 1 · Q72The photochemical smog does not generally contain :EasySingle correct
  5. 17 Mar 2021, Shift 1 · Q40Reducing smog is a mixture of :EasySingle correct
  6. 25 Feb 2021, Shift 1 · Q41Given below are two statements : Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.…MediumTwo statements
  7. 4 Aug 2021, Shift 2 · Q40The INCORRECT statement among those given below regarding smog isEasySingle correct

Shifts: 25 Feb 2021, Shift 1, 17 Mar 2021, Shift 1, 4 Aug 2021, Shift 2, 27 Jun 2022, Shift 1, 28 Jun 2022, Shift 2, 25 Jul 2022, Shift 1, 6 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