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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 22 July 2021, Shift 2, Chemistry Q41

Question 41 of 90 in this shift, Chemistry question 11 of 30, Section A.

The water having more dissolved O2\mathrm{O_2} is :
  1. (1)polluted water
  2. (2)water at 4°COfficial answer
  3. (3)water at 80°C
  4. (4)boiling water

Official answer

Option 2

NTA final key.

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. 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
  3. 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
  4. 5 Sep 2020, Shift 1 · Q39The condition that indicates a polluted environment is :EasySingle correct

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.