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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 31 August 2021, Shift 1, Chemistry Q41

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

BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively as :
  1. (1)A >> 15, B >> 47
  2. (2)A << 5 , B >> 17Official answer
  3. (3)A >> 50, B << 27
  4. (4)A >> 25, B << 17

Official answer

Option 2

NTA final key.

Chapter
Environmental Chemistry
Topic
Environmental Chemistry
Idea tested
BOD Values for Clean vs Polluted Water

Same idea in other shifts

Asked 2× in all
  1. 28 Jul 2022, Shift 1 · Q71Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. 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.