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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 4 August 2021, Shift 1, Chemistry Q36

Question 36 of 90 in this shift, Chemistry question 6 of 30, Section A.

The concentrated ores siderite and copper glance are converted to their oxides by
  1. (1)calcination of both.
  2. (2)roasting of both.
  3. (3)calcination and roasting respectively.Official answer
  4. (4)roasting and calcination respectively.

Official answer

Option 3

NTA final key.

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 Sep 2020, Shift 2 · Q38The processes of calcination and roasting in metallurgical industries, respectively, can lead to :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.