Learn

Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 26 June 2022, Shift 2, Chemistry Q65

Question 65 of 90 in this shift, Chemistry question 5 of 30, Section A.

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to
  1. (1)CaCO3\mathrm{CaCO_3} and Mg(OH)2\mathrm{Mg(OH)_2}Official answer
  2. (2)CaCO3\mathrm{CaCO_3} and MgCO3\mathrm{MgCO_3}
  3. (3)Ca(OH)2\mathrm{Ca(OH)_2} and MgCO3\mathrm{MgCO_3}
  4. (4)Ca(OH)2\mathrm{Ca(OH)_2} and Mg(OH)2\mathrm{Mg(OH)_2}

Official answer

Option 1

NTA final key.

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

Same idea in other shifts

Asked 3× in all
  1. 28 Jul 2022, Shift 2 · Q34The products obtained during treatment of hard water using Clark's method are :EasySingle correct
  2. 18 Mar 2021, Shift 1 · Q36Given below are two Statements : One is labelled as Assertion A and the other is labelled as Reason R : Assertion A : During the boiling…MediumAssertion–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 108 of the 174 JEE Main shifts held from 2017 to 2026.