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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceOtherMediumApplication

JEE Main 1 February 2024, Shift 1, Chemistry Q68

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

Which of the following reactions are disproportionation reactions ? (A) Cu+→Cu2++Cu\mathrm{Cu^+ \rightarrow Cu^{2+} + Cu} (B) 3MnO42−+4H+⟶2MnO4−+MnO2+2H2O\mathrm{3MnO_4^{2-} + 4H^+ \longrightarrow 2MnO_4^- + MnO_2 + 2H_2O} (C) 2KMnO4⟶K2MnO4+MnO2+O2\mathrm{2KMnO_4 \longrightarrow K_2MnO_4 + MnO_2 + O_2} (D) 2MnO4−+3Mn2++2H2O⟶5MnO2+4H+\mathrm{2MnO_4^- + 3Mn^{2+} + 2H_2O \longrightarrow 5MnO_2 + 4H^+} Choose the correct answer from the options given below :
  1. (1)(A), (B)Official answer
  2. (2)(A), (B), (C)
  3. (3)(B), (C), (D)
  4. (4)(A), (D)

Official answer

Option 1

NTA final key.

Chapter
Redox Reactions
Topic
Redox Reactions
Idea tested
Disproportionation Balancing

Same idea in other shifts

Asked 7× in all
  1. 6 Apr 2024, Shift 2 · Q64Match List - I with List - II. List - I (Reaction) (A) N2(g)+O2(g)→2NO(g)\mathrm{N_{2(g)}+O_{2(g)}\rightarrow 2NO_{(g)}} (B)…EasyMatch the list
  2. 29 Jan 2024, Shift 1 · Q63Chlorine undergoes disproportionation in alkaline medium as shown below :…EasySingle correct
  3. 31 Jan 2024, Shift 2 · Q65Given below are two statements : Statement I : S8\mathrm{S_8} solid undergoes disproportionation reaction under alkaline conditions to…MediumTwo statements
  4. 26 Jul 2022, Shift 1 · Q68Which of the given reactions is not an example of disproportionation reaction ?EasySingle correct
  5. 26 Jun 2022, Shift 2 · Q68Which one of the following is an example of disproportionation reaction ?MediumSingle correct
  6. 31 Aug 2021, Shift 2 · Q38In which one of the following sets all species show disproportionation reaction ?MediumSingle correct

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.