JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 16 March 2021, Shift 2, Chemistry Q34

Question 34 of 90 in this shift, Chemistry question 4 of 30, Section A.

Which of the following reduction reaction CANNOT be carried out with coke ?

(1) $\mathrm{Fe_2O_3\rightarrow Fe}$
(2) $\mathrm{ZnO\rightarrow Zn}$
(3) $\mathrm{Cu_2O\rightarrow Cu}$
(4) $\mathrm{Al_2O_3\rightarrow Al}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: General Principles and Processes of Isolation of Elements
Topic: Metallurgical Extraction
Idea tested: Gibbs Energy Equation in Metallurgy

Same topic in other shifts

All Metallurgical Extraction questions

8 Apr 2023, Shift 2 · Q65In Hall - Heroult process, the following is used for reducing $\mathrm{Al_2O_3}$ :-EasySingle correct
11 Apr 2023, Shift 1 · Q65In the extraction process of copper, the product obtained after carrying out the reactions (i)…EasySingle correct
25 Jul 2022, Shift 1 · Q67The compound(s) that is(are) removed as slag during the extraction of copper is : (A) $\mathrm{CaO}$ (B) $\mathrm{FeO}$ (C)…MediumOther
28 Jul 2022, Shift 1 · Q66Which of the reaction is suitable for concentrating ore by leaching process ?EasySingle correct
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
3 Aug 2021, Shift 2 · Q34Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Fluoride based compound…EasyAssertion–reason

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.