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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 9 April 2024, Shift 1, Chemistry Q82

Question 82 of 90 in this shift, Chemistry question 22 of 30, Section B.

The total number of species from the following in which one unpaired electron is present, is ________. N2,O2,C2−,O2−,O22−,H2+,CN−,He2+\mathrm{N_2, O_2, C_2^-, O_2^-, O_2^{2-}, H_2^+, CN^-, He_2^+}

Official answer

4

NTA final key.

Chapter
Chemical Bonding and Molecular Structure
Topic
Molecular Orbital Theory
Idea tested
Magnetic Property Prediction

Same idea in other shifts

Asked 9× in all
  1. 4 Apr 2024, Shift 1 · Q82Number of molecules/species from the following having one unpaired electron is ________. O2\mathrm{O_2}, O2−1\mathrm{O_2^{-1}}, NO,…MediumNumerical value
  2. 13 Apr 2023, Shift 1 · Q62In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?MediumSingle correct
  3. 25 Jul 2022, Shift 1 · Q81Among the following species N2, N2+, N2−, N22−, O2, O2+, O2−, O22−\mathrm{N_2,\ N_2^{+},\ N_2^{-},\ N_2^{2-},\ O_2,\ O_2^{+},\ O_2^{-},\ O_2^{2-}} the number of species…MediumNumerical value
  4. 28 Jul 2022, Shift 1 · Q83The number of paramagnetic species among the following is __________.…MediumNumerical value
  5. 4 Aug 2021, Shift 1 · Q32Consider the following species B2,C2,S2,NO,O22−\mathrm{B_2, C_2, S_2, NO, O_2^{2-}} Which set represents all paramagnetic species?MediumSingle correct
  6. 31 Aug 2021, Shift 2 · Q54According to molecular orbital theory, the number of unpaired electron(s) in O22−\mathrm{O_2^{2-}} is __________.EasyNumerical value
  7. 9 Jan 2020, Shift 1 · Q27If the magnetic moment of a dioxygen species is 1.73 B.M, it may be :MediumSingle correct
  8. 2 Apr 2017 (offline) · Q42Which of the following species is **not** paramagnetic ?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.