Learn

Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 31 August 2021, Shift 1, Chemistry Q36

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

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al2O3\mathrm{Al_2O_3} with cryolite. Reason (R) : The oxidation state of Al in cryolite is +3+3. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are correct and (R) is the correct explanation of (A).
  2. (2)Both (A) and (R) are correct but (R) is not the correct explanation of (A).Official answer
  3. (3)(A) is true but (R) is false.
  4. (4)(A) is false but (R) is true.

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
  1. 8 Apr 2023, Shift 2 · Q65In Hall - Heroult process, the following is used for reducing Al2O3\mathrm{Al_2O_3} :-EasySingle correct
  2. 24 Jun 2022, Shift 2 · Q67Which of the following chemical reactions represents Hall-Heroult Process?EasySingle correct
  3. 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
  4. 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.