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Saturday, 31 October

JEE Main · Chemistry · Coordination Compounds

High and Low Spin States

JEE Main asked High and Low Spin States 34 times in 30 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2023, 2024, 2025 and 2026. It belongs to Crystal Field Theory, in Coordination Compounds (Chemistry). The longest wait between two years asking it was 1 year. In 2020, 2021, 2022, 2023, 2024, 2025 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
34
in 30 shifts
Years
7 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2023, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.510’170.42’200.14’210.07’220.28’230.32’241.00’250.44’26

Raw count: 2017: 0 in 1 shift · 2020: 5 in 12 shifts · 2021: 4 in 24 shifts · 2022: 2 in 24 shifts · 2023: 4 in 12 shifts · 2024: 7 in 18 shifts · 2025: 8 in 8 shifts · 2026: 4 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20264 of 9
  • 2025226 of 8
  • 202426 of 18
  • 202323 of 12
  • 20222 of 24
  • 20214 of 24
  • 20205 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: application.

  • Order of unpaired electrons in complexes
  • Identify low spin diamagnetic octahedral complex

Difficulty

Easy 7Medium 25Hard 2

10 of the 34 questions had a numerical answer.

Every question

All 34 questions

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

  1. 8 Apr 2026, Shift 2 · Q71Number of paramagnetic complexes among the following is ________. [MnBr4]2−[\mathrm{MnBr_4}]^{2-}, [NiCl4]2−[\mathrm{NiCl_4}]^{2-},…MediumNumerical value
  2. 6 Apr 2026, Shift 2 · Q61Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A.…MediumOther
  3. 5 Apr 2026, Shift 2 · Q71The total number of unpaired electrons present in the d3d^3, d4d^4 (low spin) d5d^5 (high spin), d6d^6 (high spin) and d7d^7 (low spin)…EasyNumerical value
  4. 4 Apr 2026, Shift 2 · Q60Consider the metal complexes [Ni(en)3]2+\mathrm{[Ni(en)_3]^{2+}} (A), [NiCl4]2−\mathrm{[NiCl_4]^{2-}} (B) and [Ni(NH3)6]2+\mathrm{[Ni(NH_3)_6]^{2+}} (C). Choose the…MediumSingle correct
  5. 7 Apr 2025, Shift 2 · Q62The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively :…MediumSingle correct
  6. 7 Apr 2025, Shift 2 · Q73The number of paramagnetic metal complex species among [Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}}, [Co(C2O4)3]3−\mathrm{[Co(C_2O_4)_3]^{3-}},…HardNumerical value
  7. 7 Apr 2025, Shift 1 · Q73The number of paramagnetic complexes among [FeF6]3−[\mathrm{FeF_6}]^{3-}, [Fe(CN)6]3−[\mathrm{Fe(CN)_6}]^{3-}, [Mn(CN)6]3−[\mathrm{Mn(CN)_6}]^{3-},…HardNumerical value
  8. 4 Apr 2025, Shift 2 · Q60The correct order of [FeF6]3−\mathrm{[FeF_6]^{3-}}, [CoF6]3−\mathrm{[CoF_6]^{3-}}, [Ni(CO)4]\mathrm{[Ni(CO)_4]} and [Ni(CN)4]2−\mathrm{[Ni(CN)_4]^{2-}} complex…MediumSingle correct
  9. 3 Apr 2025, Shift 2 · Q62Identify the diamagnetic octahedral complex ions from below ; A. [Mn(CN)6]3−[\mathrm{Mn(CN)_6}]^{3-} B. [Co(NH3)6]3+[\mathrm{Co(NH_3)_6}]^{3+} C.…MediumOther
  10. 2 Apr 2025, Shift 2 · Q61The type of hybridization and the magnetic property of [MnCl6]3−\mathrm{[MnCl_6]^{3-}} are,MediumSingle correct
  11. 2 Apr 2025, Shift 1 · Q60Given below are two statements : Statement (I) : In octahedral complexes, when Δo<\Delta_o< P high spin complexes are formed. When…EasyTwo statements
  12. 2 Apr 2025, Shift 1 · Q74A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential (M3+/M2+\mathrm{M^{3+}/M^{2+}}). It forms a metal…MediumNumerical value
  13. 31 Jan 2024, Shift 2 · Q71Match List I with List II LIST I (Complex ion) | LIST II (Electronic Configuration) A. [Cr(H2O)6]3+\mathrm{[Cr(H_2O)_6]^{3+}} | I.…MediumMatch the list
  14. 1 Feb 2024, Shift 2 · Q70[Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}} and [CoF6]3−\mathrm{[CoF_6]^{3-}} are respectively known as :EasySingle correct
  15. 8 Apr 2024, Shift 2 · Q87Total number of unpaired electrons in the complex ions [Co(NH3)6]3+[\mathrm{Co(NH_3)_6}]^{3+} and [NiCl4]2−[\mathrm{NiCl_4}]^{2-} is ________.MediumNumerical value
  16. 8 Apr 2024, Shift 1 · Q71Number of Complexes with even number of electrons in t2g\mathrm{t_{2g}} orbitals is - [Fe(H2O)6]2+[\mathrm{Fe(H_2O)_6}]^{2+},…MediumSingle correct
  17. 4 Apr 2024, Shift 2 · Q70The number of unpaired d-electrons in [Co(H2O)6]3+\mathrm{[Co(H_2O)_6]^{3+}} is ________.MediumSingle correct
  18. 4 Apr 2024, Shift 2 · Q71If an iron (III) complex with the formula [Fe(NH3)x(CN)y]−\mathrm{[Fe(NH_3)_x(CN)_y]^{-}} has no electron in its eg\mathrm{e_g} orbital, then the value…MediumSingle correct
  19. 4 Apr 2024, Shift 1 · Q71Number of complexes from the following with even number of unpaired "d" electrons is ________. [V(H2O)6]3+[\mathrm{V(H_2O)_6}]^{3+},…MediumSingle correct
  20. 10 Apr 2023, Shift 2 · Q69The correct order of the number of unpaired electrons in the given complexes is A. [Fe(CN)6]3−[\mathrm{Fe(CN)_6}]^{3-} B. [FeF6]3−[\mathrm{FeF_6}]^{3-}…MediumOther
  21. 10 Apr 2023, Shift 1 · Q69The octahedral diamagnetic low spin complex among the following isMediumSingle correct
  22. 10 Apr 2023, Shift 1 · Q90In potassium ferrocyanide, there are ____________ pairs of electrons in the t2gt_{2g} set of orbitals.MediumNumerical value
  23. 8 Apr 2023, Shift 1 · Q70Which of the following complex is octahedral, diamagnetic and the most stable?MediumSingle correct
  24. 28 Jun 2022, Shift 2 · Q86[Fe(CN)6]4−\mathrm{[Fe(CN)_6]^{4-}} [Fe(CN)6]3−\mathrm{[Fe(CN)_6]^{3-}} [Ti(CN)6]3−\mathrm{[Ti(CN)_6]^{3-}} [Ni(CN)4]2−\mathrm{[Ni(CN)_4]^{2-}} [Co(CN)6]3−\mathrm{[Co(CN)_6]^{3-}}…MediumNumerical value
  25. 30 Jul 2022, Shift 2 · Q40In low and high spin octahedral Co3+\mathrm{Co^{3+}} complexes the number of electrons in t2g\mathrm{t_{2g}} level respectively will be .…EasySingle correct
  26. 18 Mar 2021, Shift 1 · Q58The total number of unpaired electrons present in the complex K3[Cr(oxalate)3]\mathrm{K_3[Cr(oxalate)_3]} is __________.EasyNumerical value
  27. 25 Jul 2021, Shift 1 · Q39Which one of the following species responds to an external magnetic field ?EasySingle correct
  28. 22 Jul 2021, Shift 2 · Q58The total number of unpaired electrons present in [Co(NH3)6]Cl2\mathrm{[Co(NH_3)_6]Cl_2} and [Co(NH3)6]Cl3\mathrm{[Co(NH_3)_6]Cl_3} is ________.MediumNumerical value
  29. 25 Feb 2021, Shift 1 · Q40The hybridization and magnetic nature of [Mn(CN)6]4−\mathrm{[Mn(CN)_6]^{4-}} and [Fe(CN)6]3−\mathrm{[Fe(CN)_6]^{3-}}, respectively are :MediumSingle correct
  30. 6 Sep 2020, Shift 2 · Q39For a d4\mathrm{d^4} metal ion in an octahedral field, the correct electronic configuration is :EasySingle correct
  31. 4 Sep 2020, Shift 2 · Q37The one that can exhibit highest paramagnetic behaviour among the following is : gly = glycinato; bpy = 2, 2′-bipyridineMediumSingle correct
  32. 3 Sep 2020, Shift 2 · Q37The d-electron configuration of [Ru(en)3]Cl2\mathrm{[Ru(en)_3]Cl_2} and [Fe(H2O)6]Cl2\mathrm{[Fe(H_2O)_6]Cl_2}, respectively are :MediumSingle correct
  33. 2 Sep 2020, Shift 1 · Q36For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements : (I) both the complexes can be high spin. (II)…MediumOther
  34. 9 Jan 2020, Shift 2 · Q37The correct order of the spin-only magnetic moments of the following complexes is : (I) [Cr(H2O)6]Br2\mathrm{[Cr(H_2O)_6]Br_2} (II)…MediumOther

Shifts: 9 Jan 2020, Shift 2, 2 Sep 2020, Shift 1, 3 Sep 2020, Shift 2, 4 Sep 2020, Shift 2, 6 Sep 2020, Shift 2, 25 Feb 2021, Shift 1, 18 Mar 2021, Shift 1, 22 Jul 2021, Shift 2, 25 Jul 2021, Shift 1, 28 Jun 2022, Shift 2, 30 Jul 2022, Shift 2, 8 Apr 2023, Shift 1, 10 Apr 2023, Shift 2, 10 Apr 2023, Shift 1, 31 Jan 2024, Shift 2, 1 Feb 2024, Shift 2, 4 Apr 2024, Shift 2, 4 Apr 2024, Shift 1, 8 Apr 2024, Shift 2, 8 Apr 2024, Shift 1, 2 Apr 2025, Shift 2, 2 Apr 2025, Shift 1, 3 Apr 2025, Shift 2, 4 Apr 2025, Shift 2, 7 Apr 2025, Shift 2, 7 Apr 2025, Shift 1, 4 Apr 2026, Shift 2, 5 Apr 2026, Shift 2, 6 Apr 2026, Shift 2, 8 Apr 2026, Shift 2.

Same topic

Other ideas in Crystal Field Theory

Crystal Field Theory has 15 ideas JEE Main has asked; 8 of them came up in more than one question. The 12 most asked are below.

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