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Friday, 9 October

JEE Main Chemistry · Class 11

Environmental Chemistry: JEE Main previous year questions

Environmental Chemistry had 15 questions in the 42 JEE Main shifts Lumi analysed, about 0.5 a shift, asked in 15 of 42 shifts. It ranks 23 of 30 Chemistry chapters by questions; 0% of its questions were hard.

Questions
15
in 15 of 42 shifts
A shift, on average
0.5
of 25 Chemistry questions
Since 2024
-0.7
0.7 a shift in 2017–23, 0.0 in 2024–26
Numerical answer
0
0% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
0241’173’203’213’224’231’240’250’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20203
  • 20213
  • 20223
  • 20234
  • 20241
  • 2025
  • 2026
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

1 topics and 8 distinct ideas; 5 ideas were asked more than once. Most questions are single correct and recall.

Topics, by questions
Ideas asked most
5 repeat

Every question

All 15 Environmental Chemistry questions

Newest first. Each opens with its options and the official answer.

2024 1 questions

  1. 9 Apr 2024, Shift 1 · Q67The F−\mathrm{F^-} ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much…MediumSingle correct

2023 4 questions

  1. 6 Apr 2023, Shift 1 · Q71The possibility of photochemical smog formation is more atEasySingle correct
  2. 8 Apr 2023, Shift 2 · Q70Which of these reactions is not a part of breakdown of ozone in stratosphere?MediumSingle correct
  3. 11 Apr 2023, Shift 1 · Q71Given below are two statements: Statement I: If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water. Statement II:…MediumTwo statements
  4. 13 Apr 2023, Shift 2 · Q71Which of the following are the Green house gases? A. Water vapour B. Ozone C. I2\mathrm{I_2} D. Molecular hydrogen Choose the most…EasyOther

2022 3 questions

  1. 25 Jul 2022, Shift 1 · Q72The photochemical smog does not generally contain :EasySingle correct
  2. 28 Jul 2022, Shift 1 · Q71Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II :…EasyTwo statements
  3. 29 Jun 2022, Shift 1 · Q72The acid that is believed to be mainly responsible for the damage of Taj Mahal isEasySingle correct

2021 3 questions

  1. 3 Aug 2021, Shift 2 · Q41Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Fluoride ion…EasyAssertion–reason
  2. 16 Mar 2021, Shift 2 · Q40The green house gas/es is (are ) : (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the…EasyOther
  3. 18 Mar 2021, Shift 1 · Q41The statements that are TRUE : (A) methane leads to both global warming and photochemical smog (B) methane is generated from paddy fields…MediumOther

2020 3 questions

  1. 8 Jan 2020, Shift 1 · Q38Among the gases (a) - (e), the gases that cause greenhouse effect are : (a) CO2\mathrm{CO_2} (b) H2O\mathrm{H_2O} (c) CFCs (d)…EasyOther
  2. 9 Jan 2020, Shift 2 · Q38Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm) :EasySingle correct
  3. 2 Sep 2020, Shift 1 · Q38The statement that is not true about ozone is :EasySingle correct

2017 1 questions

  1. 2 Apr 2017 (offline) · Q44A water sample has ppm level concentration of following anions F−=10\mathrm{F^-}=10 ; SO42−=100\mathrm{SO_4^{2-}}=100 ; NO3−=50\mathrm{NO_3^-}=50 The…EasySingle correct

Pattern: Asked most years.