JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 28 July 2022, Shift 1, Chemistry Q68

Question 68 of 90 in this shift, Chemistry question 8 of 30, Section A.

Which of the following statement is incorrect ?

(1)Low solubility of LiF in water is due to its small hydration enthalpy.Official answer
(2) $\mathrm{KO_2}$ is paramagnetic.
(3)Solution of sodium in liquid ammonia is conducting in nature.
(4)Sodium metal has higher density than potassium metal.

Official answer

Option 1

NTA final key (2022 Session 2).

Chapter: The s-Block Elements
Topic: s-Block Elements
Idea tested: Anomalous Solubility of Fluorides

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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.