JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 8 January 2020, Shift 1, Chemistry Q34

Question 34 of 75 in this shift, Chemistry question 9 of 25, Section A.

When gypsum is heated to 393 K, it forms :

(1)Anhydrous $\mathrm{CaSO_4}$
(2)Dead burnt plaster
(3) $\mathrm{CaSO_4\cdot 0.5\,H_2O}$ Official answer
(4) $\mathrm{CaSO_4\cdot 5\,H_2O}$

Official answer

Option 3

NTA final key (Jan 2020).

Chapter: The s-Block Elements
Topic: s-Block Elements
Idea tested: Thermal Dehydration of Gypsum

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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.