JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 24 June 2022, Shift 2, Chemistry Q67

Question 67 of 90 in this shift, Chemistry question 7 of 30, Section A.

Which of the following chemical reactions represents Hall-Heroult Process?

(1)Cr $_2$ O $_3$ +2Al $\rightarrow$ Al $_2$ O $_3$ +2Cr
(2)2Al $_2$ O $_3$ +3C $\rightarrow$ 4Al+3CO $_2$ Official answer
(3)FeO+CO $\rightarrow$ Fe+CO $_2$
(4)2[Au(CN) $_2$ ] $^-_{\text{(aq)}}$ +Zn(s) $\rightarrow$ 2Au(s)+[Zn(CN $_4$ )] $^{2-}$

Official answer

Option 2

NTA final key.

Chapter: General Principles and Processes of Isolation of Elements
Topic: Metallurgical Extraction
Idea tested: Hall-Heroult Process

Same idea in other shifts

Asked 5× in all

8 Apr 2023, Shift 2 · Q65In Hall - Heroult process, the following is used for reducing $\mathrm{Al_2O_3}$ :-EasySingle 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
31 Aug 2021, Shift 1 · Q36Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is…EasyAssertion–reason
18 Mar 2021, Shift 1 · Q35The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium 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 108 of the 174 JEE Main shifts held from 2017 to 2026.