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Chemistry - Environmental Chemistry

Practise 113 JEE Main previous year questions on Environmental Chemistry, compiled from papers spanning 2004 to 2023. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Environmental Chemistry has been asked in 14 of the 25 years of JEE Main papers analysed (2002–2026), with 113 questions in all. 84% of them were easy, 15% moderate and 1% tough. Most of its questions came from 2021, with 25 questions that year. In the last three years (2024–2026) it had 0 questions across 49 papers, about 0 per paper.

The chapter's 5 topics are not weighted equally: Air Pollution (61 questions, 54%), Water Pollution (37 questions, 33%), and Environmental Pollution and pollutants (11 questions, 10%) have been asked the most. Air Pollution has also led over the last five years, with 19 questions. Water Pollution has produced the most tough questions (1).

  1. 1The possibility of photochemical smog formation will be minimum at15 Apr, 2023 (M)Air Pollution
  2. 2The radical which mainly causes ozone depletion in the presence of UV radiations is :13 Apr, 2023 (M)Air Pollution
  3. 3Which of the following are the Green house gases? A. Water vapour B.Ozone C. I 2 D.Molecular hydrogen Choose the most appropriate answer fro13 Apr, 2023 (E)Air Pollution
  4. 4Match List I with List II List I List II A Nitrogen oxides in air I Eutrophication B Methane in air II pH of rain water becomes 5 . 6 C Carb12 Apr, 2023 (M)Environmental Pollution and pollutants
  5. 5Given 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-II11 Apr, 2023 (M)Water Pollution
  6. 6Which of the following compounds is an example of Freon?11 Apr, 2023 (E)Air Pollution
  7. 7Match List I with List II List I Industry List II Waste Generated (A) Steel plants (I) Gypsum (B) Thermal power plants (II) Fly ash (C) Fert10 Apr, 2023 (M)Environmental Pollution and pollutants
  8. 8The delicate balance of CO 2 and O 2 is NOT disturbed by10 Apr, 2023 (E)Air Pollution
  9. 9Match List I with List II List-I Species List-2 Maximum allowed concentration in ppm in drinking water A F - I 50 ppm B SO 4 2 - II 5 ppm C 08 Apr, 2023 (M)Water Pollution
  10. 10Which of these reactions is not a part of breakdown of ozone in stratosphere?08 Apr, 2023 (E)Air Pollution
  11. 11The possibility of photochemical smog formation is more at06 Apr, 2023 (M)Air Pollution
  12. 12The group of chemicals used as pesticide is06 Apr, 2023 (E)Land Pollution
  13. 13How can photochemical smog be controlled?01 Feb, 2023 (M)Air Pollution
  14. 14The industrial activity held least responsible for global warming is :01 Feb, 2023 (E)Environmental Pollution and pollutants
  15. 15The normal rain water is slightly acidic and its pH value is 5 . 6 because of which one of the following ?31 Jan, 2023 (E)Air Pollution
  16. 16Formation of photochemical smog involves the following reaction in which A , B and C are respectively. (i) NO 2 hu A + B (ii) B + O 2 C (iii30 Jan, 2023 (M)Air Pollution
  17. 17The water quality of a pond was analysed and its BOD was found to be 4 . The pond has30 Jan, 2023 (E)Water Pollution
  18. 18Correct statement about smog is29 Jan, 2023 (M)Air Pollution
  19. 19The concentration of dissolved Oxygen in water for growth of fish should be more than X ppm and Biochemical Oxygen Demand in clean water sho29 Jan, 2023 (E)Water Pollution
  20. 20Some reactions of NO 2 relevant to photochemical smog formation are Identify A , B , X and Y25 Jan, 2023 (M)Air Pollution
  21. 21Which of the following is true about freons?24 Jan, 2023 (M)Air Pollution
  22. 22Which among the following pairs has only herbicides?29 Jul, 2022 (M)Land Pollution
  23. 23Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II : Eutrop28 Jul, 2022 (M)Water Pollution
  24. 24Match List I with List II List-I Pollutant List-II Disease /sickness A Sulphate 500 ppm I Methemoglobinemia B Nitrate 50 ppm II Brown mottli27 Jul, 2022 (M)Water Pollution
  25. 25Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry. St27 Jul, 2022 (E)Environmental Pollution and pollutants
  26. 26Match List I with List II List-I Pollutant List-II Source A Microorganisms I Strip mining B Plant nutrients II Domestic sewage C Toxic heavy26 Jul, 2022 (E)Water Pollution
  27. 27The photochemical smog does not generally contain25 Jul, 2022 (M)Air Pollution
  28. 28Match List I with List II. List-I List-II A Sulphate I Pesticide B Fluoride II Bending of bones C Nicotine III Laxative effect D Sodium arsi25 Jul, 2022 (E)Water Pollution
  29. 29The acid that is believed to be mainly responsible for the damage of Taj Mahal is29 Jun, 2022 (M)Air Pollution
  30. 30Sulphur dioxide is one of the components of polluted air. SO 2 is also a major contributor to acid rain. The correct and complete reaction t29 Jun, 2022 (E)Air Pollution
  31. 31Which amongst the following is not a pesticide?28 Jun, 2022 (M)Land Pollution
  32. 32Correct statement about photo-chemical smog is28 Jun, 2022 (E)Air Pollution
  33. 33Given below are two Statements : Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulph27 Jun, 2022 (M)Air Pollution
  34. 34The measured BOD values tor four difterent water samples A - D are as tollows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water sampl26 Jun, 2022 (E)Water Pollution
  35. 35The eutrophication of water body results in25 Jun, 2022 (M)Water Pollution
  36. 36Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: Polluted water may have a value25 Jun, 2022 (E)Water Pollution
  37. 37Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not ca24 Jun, 2022 (E)Air Pollution
  38. 38Water sample is called cleanest on the basis of which one of the BOD values given below :01 Sep, 2021 (E)Water Pollution
  39. 39BOD values (in ppm ) for clean water (A) and polluted water (B) are expected respectively as:31 Aug, 2021 (M)Water Pollution
  40. 40The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :31 Aug, 2021 (E)Air Pollution
  41. 41The gas ' A ' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV -radiations in 27 Aug, 2021 (M)Air Pollution
  42. 42In stratosphere most of the ozone formation is assisted by :27 Aug, 2021 (E)Air Pollution
  43. 43The conversion of hydroxyapatite occurs due to presence of F - ions in water. The correct formula of hydroxyapatite is:26 Aug, 2021 (M)Water Pollution
  44. 44Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason ( R ) Assertion (A) : Photochemical sm26 Aug, 2021 (E)Air Pollution
  45. 45Which one of the following statements is NOT correct?27 Jul, 2021 (M)Water Pollution
  46. 46Match List - I with List - II : List - I (compound) List - II (effect/affected species) a Carbon monoxide i Carcinogenic b Sulphur dioxide i27 Jul, 2021 (E)Environmental Pollution and pollutants
  47. 47Which one of the following chemical agent is not being used for dry-cleaning of clothes?25 Jul, 2021 (M)Water Pollution
  48. 48Given below are two statements : Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine25 Jul, 2021 (E)Air Pollution
  49. 49The water having more dissolved O 2 is :22 Jul, 2021 (M)Water Pollution
  50. 50Green chemistry in day-to-day life is in the use of:20 Jul, 2021 (M)Control of environmental pollution

Frequently Asked Questions

1.How many questions are available for Environmental Chemistry?

This chapter includes 113 questions compiled from JEE Main papers spanning 2004 to 2023.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Environmental Chemistry chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Environmental Chemistry an important chapter for JEE Main Chemistry?

Environmental Chemistry has appeared in 14 of the 25 years of JEE Main papers covered here, with 113 questions across 105 papers - about one per paper it appears in.

4.What is the difficulty level of Environmental Chemistry questions in JEE Main?

Of the 113 questions analysed for this chapter, 84% are easy, 15% moderate and 1% tough. 2021 had the most, with 25 questions.

5.Which topics in Environmental Chemistry should I focus on?

These topics have carried the most weightage in Environmental Chemistry:

  • Air Pollution - 61 questions (54%)
  • Water Pollution - 37 questions (33%)
  • Environmental Pollution and pollutants - 11 questions (10%)
  • Water Pollution has produced the most tough questions (1).
6.Is Environmental Chemistry's weightage in JEE Main going up or down?

Across all 105 papers analysed, Environmental Chemistry has averaged about 1.1 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.