JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 31 August 2021, Shift 2, Chemistry Q38

Question 38 of 90 in this shift, Chemistry question 8 of 30, Section A.

In which one of the following sets all species show disproportionation reaction ?

(1) $\mathrm{ClO_2^-}$ , $\mathrm{F_2}$ , $\mathrm{MnO_4^-}$ and $\mathrm{Cr_2O_7^{2-}}$
(2) $\mathrm{Cr_2O_7^{2-}}$ , $\mathrm{MnO_4^-}$ , $\mathrm{ClO_2^-}$ and $\mathrm{Cl_2}$
(3) $\mathrm{ClO_4^-}$ , $\mathrm{MnO_4^-}$ , $\mathrm{ClO_2^-}$ and $\mathrm{F_2}$
(4) $\mathrm{MnO_4^-}$ , $\mathrm{ClO_2^-}$ , $\mathrm{Cl_2}$ and $\mathrm{Mn^{3+}}$ Official answer

Official answer

Option 4

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.