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Saturday, 31 October

JEE Main · Chemistry · Chemical Bonding and Molecular Structure

Oxygen Ion Series Comparison

JEE Main asked Oxygen Ion Series Comparison 4 times in 4 of the 108 shifts Lumi analysed, in 2021, 2022 and 2026. It belongs to Molecular Orbital Theory, in Chemical Bonding and Molecular Structure (Chemistry). The longest wait between two years asking it was 4 years. In 2021 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200.07’210.03’220’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 1 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 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
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20212 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: conceptual.

  • Statement i/ii on bond length and unpaired electrons
  • Bond order order of o2 species

Difficulty

Easy 2Medium 2Hard 0

Every question was multiple choice.

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. 2 Apr 2026, Shift 1 · Q53Given below are two statements : Statement (I) : The correct sequence of bond lengths in the following species is :…MediumTwo statements
  2. 26 Jun 2022, Shift 1 · Q64Consider the ions/molecule O2+,O2,O2−,O22−\mathrm{O_2^+, O_2, O_2^-, O_2^{2-}} For increasing bond order the correct option is :EasySingle correct
  3. 25 Jul 2021, Shift 2 · Q31In the following the correct bond order sequence is :EasySingle correct
  4. 26 Aug 2021, Shift 2 · Q32The bond order and magnetic behaviour of O2−\mathrm{O_2^-} ion are, respectively :MediumSingle correct

Shifts: 25 Jul 2021, Shift 2, 26 Aug 2021, Shift 2, 26 Jun 2022, Shift 1, 2 Apr 2026, Shift 1.

Same topic

Other ideas in Molecular Orbital Theory

Molecular Orbital Theory has 11 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas