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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 5 September 2020, Shift 1, Chemistry Q39

Question 39 of 75 in this shift, Chemistry question 14 of 25.

The condition that indicates a polluted environment is :
  1. (1)pH of rain water to be 5.6
  2. (2)0.03% of CO2\mathrm{CO_2} in the atmosphere
  3. (3)BOD value of 5 ppm
  4. (4)eutrophicationOfficial answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Environmental Chemistry
Topic
Environmental Chemistry
Idea tested
Eutrophication and Dissolved Oxygen Limits

Same idea in other shifts

Asked 5× in all
  1. 25 Jun 2022, Shift 1 · Q70The eutrophication of water body results in :EasySingle correct
  2. 22 Jul 2021, Shift 2 · Q41The water having more dissolved O2\mathrm{O_2} is :EasySingle correct
  3. 17 Mar 2021, Shift 2 · Q41Which of the following statement(s) is (are) incorrect reason for eutrophication ? (A) excess usage of fertilisers (B) excess usage of…EasyOther
  4. 18 Mar 2021, Shift 2 · Q41Given below are two statements : Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II :…EasyTwo statements

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.