Learn

Saturday, 31 October

JEE Main · Chemistry · Redox Reactions

Law of Chemical Equivalence in Redox

JEE Main asked Law of Chemical Equivalence in Redox 6 times in 6 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2024 and 2026. It belongs to Redox Reactions (Chemistry). The longest wait between two years asking it was 2 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
6
in 6 shifts
Years
5 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170.08’200.07’210.03’220’230.05’240’250.11’26

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

Shift by shift

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

  • 20261 of 9
  • 20250 of 8
  • 20241 of 18
  • 20230 of 12
  • 20221 of 24
  • 20212 of 24
  • 20201 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.

  • Molarity from redox titration
  • Moles of oxidant for mixture

Difficulty

Easy 1Medium 5Hard 0

5 of the 6 questions had a numerical answer.

Every question

All 6 questions

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

  1. 4 Apr 2026, Shift 1 · Q56In order to oxidise a mixture of 11 mole each of FeC2O4\mathrm{FeC_2O_4}, Fe2(C2O4)3\mathrm{Fe_2(C_2O_4)_3}, FeSO4\mathrm{FeSO_4} and…MediumSingle correct
  2. 4 Apr 2024, Shift 1 · Q87Only 2 mL of KMnO4\mathrm{KMnO_4} solution of unknown molarity is required to reach the end point of a titration of 20 mL of oxalic acid (2…MediumNumerical value
  3. 27 Jul 2022, Shift 1 · Q8120 mL of 0.02 M K2Cr2O7\mathrm{K_2Cr_2O_7} solution is used for the titration of 10 mL of Fe2+\mathrm{Fe^{2+}} solution in the acidic medium. The…EasyNumerical value
  4. 17 Mar 2021, Shift 1 · Q5715 mL of aqueous solution of Fe2+\mathrm{Fe^{2+}} in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr2O72−\mathrm{Cr_2O_7^{2-}}.…MediumNumerical value
  5. 25 Feb 2021, Shift 1 · Q55In basic medium CrO42−\mathrm{CrO_4^{2-}} oxidises S2O32−\mathrm{S_2O_3^{2-}} to form SO42−\mathrm{SO_4^{2-}} and itself changes into…MediumNumerical value
  6. 4 Sep 2020, Shift 1 · Q49A 20.0 mL solution containing 0.2 g impure H2O2\mathrm{H_2O_2} reacts completely with 0.316 g of KMnO4\mathrm{KMnO_4} in acid solution. The…MediumNumerical value

Shifts: 4 Sep 2020, Shift 1, 25 Feb 2021, Shift 1, 17 Mar 2021, Shift 1, 27 Jul 2022, Shift 1, 4 Apr 2024, Shift 1, 4 Apr 2026, 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