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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonMediumConceptual

JEE Main 18 March 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 : During the boiling of water having temporary hardness, Mg(HCO3)2\mathrm{Mg(HCO_3)_2} is converted to MgCO3\mathrm{MgCO_3}. Reason R : The solubility product of Mg(OH)2\mathrm{Mg(OH)_2} is greater than that of MgCO3\mathrm{MgCO_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 true and R is the correct explanation of A
  2. (2)Both A and R are true but R is NOT the correct explanation of A
  3. (3)A is true but R is false
  4. (4)A is false but R is trueOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Hydrogen
Topic
Hydrogen and Hydrides
Idea tested
Temporary Hardness and Clark's Method

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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.