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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 4 September 2020, Shift 2, Chemistry Q38

Question 38 of 75 in this shift, Chemistry question 13 of 25.

The processes of calcination and roasting in metallurgical industries, respectively, can lead to :
  1. (1)Global warming and acid rainOfficial answer
  2. (2)Global warming and photochemical smog
  3. (3)Photochemical smog and global warming
  4. (4)Photochemical smog and ozone layer depletion

Official answer

Option 1

NTA final key (Sep 2020).

Chapter
General Principles and Processes of Isolation of Elements
Topic
Metallurgical Extraction
Idea tested
Calcination vs. Roasting

Same idea in other shifts

Asked 3× in all
  1. 15 Apr 2023, Shift 1 · Q65Which one of the following is not an example of calcination?EasySingle correct
  2. 4 Aug 2021, Shift 1 · Q36The concentrated ores siderite and copper glance are converted to their oxides byEasySingle 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.