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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 17 March 2021, Shift 1, Chemistry Q40

Question 40 of 90 in this shift, Chemistry question 10 of 30, Section A.

Reducing smog is a mixture of :
  1. (1)Smoke, fog and O3\mathrm{O_3}
  2. (2)Smoke, fog and SO2\mathrm{SO_2}Official answer
  3. (3)Smoke, fog and N2O3\mathrm{N_2O_3}
  4. (4)Smoke, fog and CH2=CH−CHO\mathrm{CH_2=CH-CHO}

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. 25 Feb 2021, Shift 1 · Q41Given below are two statements : Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.…MediumTwo 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.