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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceMatch the listEasyRecall

JEE Main 25 July 2021, Shift 2, Chemistry Q35

Question 35 of 90 in this shift, Chemistry question 5 of 30, Section A.

Match List I with List II : (Both having metallurgical terms) List - I (a) Concentration of Ag ore (b) Blast furnace (c) Blister copper (d) Froth floatation method List - II (i) Reverberatory furnace (ii) Pig iron (iii) Leaching with dilute NaCN solution (iv) Sulfide ores Choose the correct answer from the options given below :
  1. (1)(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)Official answer
  2. (2)(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
  3. (3)(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
  4. (4)(a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)

Official answer

Option 1

NTA final key.

Chapter
General Principles and Processes of Isolation of Elements
Topic
Metallurgical Extraction
Idea tested
MacArthur-Forrest Cyanide Process

Same idea in other shifts

Asked 6× in all
  1. 30 Jul 2022, Shift 2 · Q36Match List I with List II List I | List II A. Cyanide Process | I. Vapour phase refining B. Froth flotation process | II. Aluminium C.…EasyMatch the list
  2. 25 Jun 2022, Shift 1 · Q64Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the…EasySingle correct
  3. 27 Jun 2022, Shift 1 · Q66Match List - I with List - II. List - I (A) Concentration of gold ore (B) Leaching of alumina (C) Froth stabiliser (D) Blister copper List…MediumMatch the list
  4. 27 Jun 2022, Shift 2 · Q63**Statement I:** Leaching of gold with cyanide ion in absence of air / O2\mathrm{O_2} leads to cyano complex of Au(III). **Statement II:**…MediumTwo statements
  5. 29 Jun 2022, Shift 1 · Q67In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved ?MediumSingle 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.