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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 25 June 2022, Shift 2, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Polluted water may have a value of BOD of the order of 17 ppm. Reason R: BOD is a measure of oxygen required to oxidise both the bio-degradable and non-biodegradable organic material in water. In the light of the above statements, choose the most appropriate answer from the options given below.
  1. (1)Both A and R are correct and R is the correct explanation of A.
  2. (2)Both A and R are correct but R is NOT the correct explanation of A.
  3. (3)A is correct but R is not correct.Official answer
  4. (4)A is not correct but R is correct.

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. 26 Jun 2022, Shift 2 · Q70The 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…EasySingle correct
  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.