/

Learn

Friday, 9 October

/

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 28 July 2022, Shift 1, Chemistry Q66

Question 66 of 90 in this shift, Chemistry question 6 of 30, Section A.

Which of the reaction is suitable for concentrating ore by leaching process ?

(1) $\mathrm{2Cu_2S+3O_2\to2Cu_2O+2SO_2}$
(2) $\mathrm{Fe_3O_4+CO\to3FeO+CO_2}$
(3) $\mathrm{Al_2O_3+2NaOH+3H_2O\to2Na[Al(OH)_4]}$ Official answer
(4) $\mathrm{Al_2O_3+6Mg\to6MgO+4Al}$

Official answer

Option 3

NTA final key (2022 Session 2).

Chapter: General Principles and Processes of Isolation of Elements
Topic: Metallurgical Extraction
Idea tested: Bayer Process Chemistry

Same idea in other shifts

Asked 2× in all

25 Jul 2021, Shift 1 · Q34In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :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 42 of the 174 JEE Main shifts held from 2017 to 2026.