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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceTwo statementsMediumConceptual

JEE Main 2 April 2026, Shift 1, Chemistry Q53

Question 53 of 75 in this shift, Chemistry question 3 of 25, Section A.

Given below are two statements : Statement (I) : The correct sequence of bond lengths in the following species is : O2+<O2<O2−<O22−\mathrm{O_2^+<O_2<O_2^-<O_2^{2-}} Statement (II) : The correct sequence of number of unpaired electrons in the following species is : O2>O2+>O2−>O22−\mathrm{O_2>O_2^+>O_2^->O_2^{2-}} In the light of the above statements, choose the correct answer from the options given below :
  1. (1)Both Statement I and Statement II are true
  2. (2)Both Statement I and Statement II are false
  3. (3)Statement I is true but Statement II is falseOfficial answer
  4. (4)Statement I is false but Statement II is true

Official answer

Option 3

NTA final key.

Chapter
Chemical Bonding and Molecular Structure
Topic
Molecular Orbital Theory
Idea tested
Oxygen Ion Series Comparison

Same idea in other shifts

Asked 4× in all
  1. 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
  2. 26 Aug 2021, Shift 2 · Q32The bond order and magnetic behaviour of O2−\mathrm{O_2^-} ion are, respectively :MediumSingle correct
  3. 25 Jul 2021, Shift 2 · Q31In the following the correct bond order sequence is :EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.