JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 3 August 2021, Shift 2, Chemistry Q36

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

A 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 (X) and (B). What is (Y)?

(1) $\mathrm{CaCO_3}$
(2) $\mathrm{CaO}$ Official answer
(3) $\mathrm{Ca(OH)_2}$
(4) $\mathrm{CaCl_2}$ .

Official answer

Option 2

NTA final key.

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

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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.