Learn

Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceTwo statementsMediumRecall

JEE Main 11 April 2023, Shift 1, Chemistry Q71

Question 71 of 90 in this shift, Chemistry question 11 of 30, Section A.

Given 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: If the concentration of zinc and nitrate salts are 5 ppm each, then it can be a good quality water. In the light of the above statements, choose the most appropriate answer from the options given below:
  1. (1)Both the statements I and II are correctOfficial answer
  2. (2)Both the statements I and II are incorrect
  3. (3)Statement I is correct but Statement II is incorrect
  4. (4)Statement I is incorrect but Statement II is correct

Official answer

Option 1

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. 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
  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.