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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 26 June 2022, Shift 2, Chemistry Q70

Question 70 of 90 in this shift, Chemistry question 10 of 30, Section A.

The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B=18 ppm; C=21 ppm; D=4 ppm. The water samples which can be called as highly polluted with organic wastes, are
  1. (1)A and B
  2. (2)A and D
  3. (3)B and COfficial answer
  4. (4)B and D

Official answer

Option 3

NTA final key.

Chapter
Environmental Chemistry
Topic
Environmental Chemistry
Idea tested
Water Quality BOD and COD

Same idea in other shifts

Asked 5× in all
  1. 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
  2. 25 Jun 2022, Shift 2 · Q72Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Polluted water may have…MediumAssertion–reason
  3. 24 Feb 2021, Shift 2 · Q41Given below are two statements : Statement I :\textbf{Statement I :} The value of the parameter “Biochemical Oxygen Demand (BOD)” is important for…EasyTwo statements
  4. 9 Jan 2020, Shift 2 · Q38Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm) :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.