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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 26 August 2021, Shift 2, Chemistry Q32

Question 32 of 90 in this shift, Chemistry question 2 of 30, Section A.

The bond order and magnetic behaviour of O2−\mathrm{O_2^-} ion are, respectively :
  1. (1)1 and paramagnetic.
  2. (2)1.5 and paramagnetic.Official answer
  3. (3)2 and diamagnetic.
  4. (4)1.5 and diamagnetic.

Official answer

Option 2

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. 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

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.