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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceAssertion–reasonMediumRecall

JEE Main 26 August 2021, Shift 2, Chemistry Q37

Question 37 of 90 in this shift, Chemistry question 7 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) : Barium carbonate is insoluble in water and is highly stable. Reason (R) : The thermal stability of the carbonates increases with increasing cationic size. Choose the most appropriate answer from the options given below :
  1. (1)Both (A) and (R) are true and (R) is the true explanation of (A).Official answer
  2. (2)Both (A) and (R) are true but (R) is not the true explanation of (A).
  3. (3)(A) is true but (R) is false.
  4. (4)(A) is false but (R) is true.

Official answer

Option 1

NTA final key.

Chapter
The s-Block Elements
Topic
s-Block Elements
Idea tested
Thermal Stability Trends

Same idea in other shifts

Asked 3× in all
  1. 29 Jul 2022, Shift 1 · Q67Lithium nitrate and sodium nitrate, when heated separately, respectively, give :EasySingle correct
  2. 3 Aug 2021, Shift 2 · Q36A white solid (X) on heating forms a solid (Y) and a gas (Z). Another solid (B) forms (X) by reacting with (Z). (Y) can be converted into…MediumSingle 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.