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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 4 August 2021, Shift 2, Chemistry Q40

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

The INCORRECT statement among those given below regarding smog is
  1. (1)Photochemical smog occurs primarily in warm, dry and sunny climate.
  2. (2)Classical smog is also called oxidizing smog.Official answer
  3. (3)Peroxyacetyl nitrate is a component of photochemical smog.
  4. (4)Photochemical smog leads to cracking of rubber.

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. 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
  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.