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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceTwo statementsMediumConceptual

JEE Main 25 February 2021, Shift 1, Chemistry Q41

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

Given below are two statements : Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below :
  1. (1)Both Statement I and Statement II are true
  2. (2)Both Statement I and Statement II are falseOfficial answer
  3. (3)Statement I is true but Statement II is false
  4. (4)Statement I is false but Statement II is true

Official answer

Option 2

NTA final key.

Chapter
Environmental Chemistry
Topic
Environmental Chemistry
Idea tested
Classical vs Photochemical Smog

Same idea in other shifts

Asked 7× in all
  1. 6 Apr 2023, Shift 1 · Q71The possibility of photochemical smog formation is more atEasySingle correct
  2. 25 Jul 2022, Shift 1 · Q72The photochemical smog does not generally contain :EasySingle correct
  3. 27 Jun 2022, Shift 1 · Q72Given below are two Statements : Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and…EasyTwo statements
  4. 28 Jun 2022, Shift 2 · Q72Correct statement about photo-chemical smog is :EasySingle correct
  5. 4 Aug 2021, Shift 2 · Q40The INCORRECT statement among those given below regarding smog isEasySingle correct
  6. 17 Mar 2021, Shift 1 · Q40Reducing smog is a mixture of :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.