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Saturday, 31 October

JEE Main · Chemistry · Redox Reactions

Oxidation Number Assignment

JEE Main asked Oxidation Number Assignment 9 times in 9 of the 108 shifts Lumi analysed, in 2021, 2022, 2023 and 2024. It belongs to Redox Reactions (Chemistry). The longest wait between two years asking it was 1 year. In 2021, 2022, 2023 and 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
9
in 9 shifts
Years
4 of 8
First asked
2021
last in 2024
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2023 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200.10’210.07’220.14’230.09’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 3 in 24 shifts · 2022: 2 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
  • 20222 of 24
  • 20213 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.

  • Oxidation state in complex salt
  • Statement i/ii on oxidation state and bonding

Difficulty

Easy 6Medium 3Hard 0

5 of the 9 questions had a numerical answer.

Every question

All 9 questions

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

  1. 27 Jan 2024, Shift 1 · Q85From the given list, the number of compounds with +4 oxidation state of Sulphur is __________.…EasyNumerical value
  2. 9 Apr 2024, Shift 1 · Q65Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its…MediumTwo statements
  3. 15 Apr 2023, Shift 1 · Q90In Chromyl chloride, the oxidation state of chromium is (+) __________.EasyNumerical value
  4. 6 Apr 2023, Shift 1 · Q90In ammonium – phosphomolybdate, the oxidation state of Mo is + ________MediumNumerical value
  5. 24 Jun 2022, Shift 1 · Q86The difference in oxidation state of chromium in chromate and dichromate salts is ______.EasyNumerical value
  6. 27 Jul 2022, Shift 1 · Q88In the titration of KMnO4\mathrm{KMnO_4} and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is _____EasyNumerical value
  7. 18 Mar 2021, Shift 2 · Q38The oxidation states of nitrogen in NO, NO2\mathrm{NO_2}, N2O\mathrm{N_2O} and NO3−\mathrm{NO_3^-} are in the order of :EasySingle correct
  8. 25 Jul 2021, Shift 2 · Q32Identify the process in which change in the oxidation state is five :EasySingle correct
  9. 27 Aug 2021, Shift 1 · Q39In polythionic acid, H2SxO6\mathrm{H_2S_xO_6} (xx = 3 to 5) the oxidation state(s) of sulphur is/are :MediumSingle correct

Shifts: 18 Mar 2021, Shift 2, 25 Jul 2021, Shift 2, 27 Aug 2021, Shift 1, 24 Jun 2022, Shift 1, 27 Jul 2022, Shift 1, 6 Apr 2023, Shift 1, 15 Apr 2023, Shift 1, 27 Jan 2024, Shift 1, 9 Apr 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