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Saturday, 31 October

JEE Main · Chemistry · Redox Reactions

Oxidation State Method

JEE Main asked Oxidation State Method 2 times in 2 of the 108 shifts Lumi analysed, all in 2020. It belongs to Redox Reactions (Chemistry). In 2020 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
1 of 8
First asked
2020
the only year
Pattern
Gone quiet
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170.17’200’210’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20210 of 24
  • 20202 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.

  • Sum of coefficients on balancing redox equations
  • Sum of oxidation states of transition metals

Difficulty

Easy 1Medium 1Hard 0

2 of the 2 questions had a numerical answer.

Every question

All 2 questions

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

  1. 4 Sep 2020, Shift 2 · Q49Consider the following equations : 2 Fe2++H2O2→x A+y B2\ \mathrm{Fe^{2+} + H_2O_2} \rightarrow x\ \mathrm{A} + y\ \mathrm{B} (in basic medium)…MediumNumerical value
  2. 2 Sep 2020, Shift 2 · Q49The oxidation states of transition metal atoms in K2Cr2O7\mathrm{K_2Cr_2O_7}, KMnO4\mathrm{KMnO_4} and K2FeO4\mathrm{K_2FeO_4}, respectively, are xx,…EasyNumerical value

Shifts: 2 Sep 2020, Shift 2, 4 Sep 2020, Shift 2.

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