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Saturday, 31 October

JEE Main · Chemistry · Redox Reactions

Ion-Electron Acidic

JEE Main asked Ion-Electron Acidic 4 times in 4 of the 108 shifts Lumi analysed, in 2023 and 2024. It belongs to Redox Reactions (Chemistry). The longest wait between two years asking it was 1 year. In 2023 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
2 of 8
First asked
2023
last in 2024
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2023 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200’210’220.14’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 2 in 12 shifts · 2024: 2 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20242 of 18
  • 20232 of 12
  • 20220 of 24
  • 20210 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • H+ required in permanganate oxalate reaction
  • Sum of coefficients in balanced redox

Difficulty

Easy 3Medium 1Hard 0

2 of the 4 questions had a numerical answer.

Every question

All 4 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 31 Jan 2024, Shift 2 · Q86Number of moles of H+\mathrm{H^+} ions required by 1 mole of MnO4−\mathrm{MnO_4^-} to oxidise oxalate ion to CO2\mathrm{CO_2} is ________.MediumNumerical value
  2. 1 Feb 2024, Shift 1 · Q67In acidic medium, K2Cr2O7\mathrm{K_2Cr_2O_7} shows oxidising action as represented in the half reaction :…EasySingle correct
  3. 13 Apr 2023, Shift 2 · Q88See the following chemical reaction:…EasyNumerical value
  4. 8 Apr 2023, Shift 1 · Q612IO3−+xI−+12H+→6I2+6H2O2\mathrm{IO_3^-} + x\mathrm{I^-} + 12\mathrm{H^+} \rightarrow 6\mathrm{I_2} + 6\mathrm{H_2O} What is the value of xx?EasySingle correct

Shifts: 8 Apr 2023, Shift 1, 13 Apr 2023, Shift 2, 31 Jan 2024, Shift 2, 1 Feb 2024, Shift 1.

Same topic

Other ideas in Redox Reactions

Redox Reactions has 16 ideas JEE Main has asked; 10 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas