JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 26 July 2022, Shift 1, Chemistry Q68

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

Which of the given reactions is not an example of disproportionation reaction ?

(1) $2\mathrm{H_2O_2} \rightarrow 2\mathrm{H_2O} + \mathrm{O_2}$
(2) $2\mathrm{NO_2} + \mathrm{H_2O} \rightarrow \mathrm{HNO_3} + \mathrm{HNO_2}$
(3) $\mathrm{MnO_4^-} + 4\mathrm{H^+} + 3e^- \rightarrow \mathrm{MnO_2} + 2\mathrm{H_2O}$ Official answer
(4) $3\mathrm{MnO_4^{2-}} + 4\mathrm{H^+} \rightarrow 2\mathrm{MnO_4^-} + \mathrm{MnO_2} + 2\mathrm{H_2O}$

Official answer

Option 3

NTA final key.

Chapter: Redox Reactions
Topic: Redox Reactions
Idea tested: Disproportionation Balancing

Same idea in other shifts

Asked 7× in all

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.