JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 4 September 2020, Shift 1, Chemistry Q34

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

On combustion of Li, Na and K in excess of air, the major oxides formed, respectively, are :

(1) $\mathrm{Li_2O}$ , $\mathrm{Na_2O}$ and $\mathrm{K_2O_2}$
(2) $\mathrm{Li_2O}$ , $\mathrm{Na_2O_2}$ and $\mathrm{KO_2}$ Official answer
(3) $\mathrm{Li_2O}$ , $\mathrm{Na_2O_2}$ and $\mathrm{K_2O}$
(4) $\mathrm{Li_2O_2}$ , $\mathrm{Na_2O_2}$ and $\mathrm{K_2O_2}$

Official answer

Option 2

NTA final key (Sep 2020).

Chapter: The s-Block Elements
Topic: s-Block Elements
Idea tested: Formation of Oxides, Peroxides, and Superoxides

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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 108 of the 174 JEE Main shifts held from 2017 to 2026.