JEE Chemistry

Crystal Field Theory: JEE Questions & Solutions

56 previous-year JEE Chemistry questions on Crystal Field Theory, each with a worked step-by-step solution.

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Previous-year questions

  1. 01Given below are two statements: Statement I: Among [Cu(NH₃)₄]²⁺, [Ni(en)₃]²⁺, [Ni(NH₃)₆]²⁺ and [Mn(H₂O)₆]²⁺, [Mn(H₂O)₆]²⁺ has the maximum…MCQMediumJEE 2026
  2. 02Given below are two statements: Statement I: Crystal Field Stabilization Energy (CFSE) of [Cr(H₂O)₆]²⁺ is greater than that of…MCQMediumJEE 2026
  3. 03Identify the metal ions among Co²⁺, Ni²⁺, Fe²⁺, V³⁺ and Ti²⁺ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired…NVAMediumJEE 2026
  4. 04Consider the transition metal ions Mn³⁺, Cr³⁺, Fe³⁺ and Co³⁺ and all form low spin octahedral complexes. The correct decreasing order of…MCQEasyJEE 2026
  5. 05[Ni(PPh₃)₂Cl₂] is a paramagnetic complex. Identify the INCORRECT statements about this complex. A. The complex exhibits geometrical…MCQMediumJEE 2026
  6. 06Given below are two statements: Statement I: [CoBr₄]²⁻ ion will absorb light of lower energy than [CoCl₄]²⁻ ion. Statement II: In [CoI₄]²⁻…MCQEasyJEE 2026
  7. 07The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are: A. It is red in colour. B. It has a high solubility…MCQMediumJEE 2026
  8. 08The crystal field splitting energy of [Co(oxalate)₃]³⁻ complex is 'n' times that of the [Cr(oxalate)₃]³⁻ complex. Here 'n' is (Assume Δ₀ ≫…NVAMediumJEE 2026
  9. 09Total number of unpaired electrons present in the central metal atoms/ions of [Ni(CO)₄], [NiCl₄]²⁻, [PtCl₂(NH₃)₂], [Ni(CN)₄]²⁻ and…NVAEasyJEE 2026
  10. 10Given below are two statements: Statement I: The number of paramagnetic species among [CoF₆]³⁻, [TiF₆]³⁻, V₂O₅ and [Fe(CN)₆]³⁻ is 3.…MCQMediumJEE 2026
  11. 11The wavelength of light absorbed for the following complexes are in the order [Co(NH₃)₆]³⁺ (I), [Co(H₂O)₆]³⁺ (II), [Co(CN)₆]³⁻ (III),…MCQEasyJEE 2026
  12. 12The correct statement among the following is:MCQEasyJEE 2026
  13. 13The correct increasing order of spin-only magnetic moment values of the complex ions [MnBr4]²⁻ (A), [Cu(H2O)6]²⁺ (B), [Ni(CN)4]²⁻ (C) and…MCQMediumJEE 2026
  14. 14The number of isoelectronic species among Sc³⁺, Cr²⁺, Mn³⁺, Co³⁺ and Fe³⁺ is ‘n’. If ‘n’ moles of AgCl is formed during the reaction of…NVAMediumJEE 2026
  15. 15In which of the following complexes the CFSE, Δ₀ will be equal to zero?MCQMediumJEE 2025
  16. 16From the magnetic behaviour of [NiCl₄]²⁻ (paramagnetic) and [Ni(CO)₄] (diamagnetic), choose the correct geometry and oxidation state.MCQEasyJEE 2025
  17. 17The correct order of the following complexes in terms of their crystal field stabilization energies is:MCQEasyJEE 2025
  18. 18The d-electronic configuration of an octahedral Co(II) complex having a magnetic moment of 3.95 BM is:MCQEasyJEE 2025
  19. 19The conditions and consequences that favour the t_2g³ e_g¹ configuration in a metal complex are:MCQEasyJEE 2025
  20. 20The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet color in non-luminous…MCQEasyJEE 2025
  21. 21Total number of molecules/species from the following which will be paramagnetic is. O₂, O₂⁺, O₂⁻, NO, NO₂, CO, K₂[NiCl₄], [Co(NH₃)₆]Cl₃,…NVAMediumJEE 2025
  22. 22The correct increasing order of stability of the complexes based on Δₒ value is: (I) [Mn(CN)₆]³⁻    (II) [Co(CN)₆]⁴⁻ (III)…MCQMediumJEE 2025
  23. 23Consider the following low-spin complexes: K₃[Co(NO₂)₆], K₄[Fe(CN)₆], K₃[Fe(CN)₆], Cu₂[Fe(CN)₆] and Zn₂[Fe(CN)₆] The sum of the spin-only…NVAMediumJEE 2025
  24. 24Given below are two statements: Statement I: In octahedral complexes, when Δₒ < P high spin complexes are formed. When Δₒ > P low spin…MCQEasyJEE 2025
  25. 25A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential (M³⁺/M²⁺). It forms a metal complex of the type…NVAMediumJEE 2025
  26. 26The correct order of the complexes [Co(NH₃)₅(H₂O)]³⁺ (A), [Co(NH₃)₆]³⁺ (B), [Co(CN)₆]³⁻ (C), [CoCl(NH₃)₅]²⁺ (D) in terms of wavelength of…MCQEasyJEE 2025
  27. 27Identify the diamagnetic octahedral complex ions from below; A. [Mn(CN)₆]³⁻ B. [Co(NH₃)₆]³⁺ C. [Fe(CN)₆]⁴⁻ D. [Co(H₂O)₃F₃] Choose the…MCQMediumJEE 2025
  28. 28Which one of the following complexes will have Δ₀=0 and μ=5.96 B.M.?MCQMediumJEE 2025
  29. 29The correct order of [FeF₆]³⁻, [CoF₆]³⁻, [Ni(CO)₄] and [Ni(CN)₄]²⁻ complex species based on the number of unpaired electrons present is:MCQEasyJEE 2025
  30. 30‘X’ is the number of electrons in t_2g orbitals of the most stable complex ion among [Fe(NH₃)₆]³⁺, [Fe(Cl)₆]³⁻, [Fe(C₂O₄)₃]³⁻ and…MCQMediumJEE 2025
  31. 31The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [Fe(CN)₆]³⁻,…MCQMediumJEE 2025
  32. 32The number of paramagnetic metal complex species among [Co(NH₃)₆]³⁺, [Co(C₂O₄)₃]³⁻, [MnCl₆]³⁻, [Mn(CN)₆]³⁻, [CoF₆]³⁻, [Fe(CN)₆]³⁻ and…NVAMediumJEE 2025
  33. 33Match the LIST-I with LIST-II LIST-I (Complex/Species) LIST-II (Shape & magnetic moment) A. [Ni(CO)₄] I. Tetrahedral, 2.8 BM B. [Ni(CN)₄]²⁻…MCQMediumJEE 2025
  34. 34Consider the following complex ions: P = [FeF₆]³⁻ Q = [V(H₂O)₆]²⁺ R = [Fe(H₂O)₆]²⁺ The correct order of the complex ions, according to…MCQEasyJEE 2024
  35. 35The spin-only magnetic moment value of square planar complex [Pt(NH₃)₂Cl(NH₂CH₃)]Cl is x B.M. (nearest integer). The value of x is: (Given…NVAEasyJEE 2024
  36. 36The correct statements from the following are: A. The strength of anionic ligands can be explained by crystal field theory. B. Valence bond…MCQMediumJEE 2024
  37. 37Which of the following cannot be explained by crystal field theory?MCQEasyJEE 2023
  38. 38The number of paramagnetic species from the following is. [Ni(CN)₄]²⁻, [Ni(CO)₄], [NiCl₄]²⁻, [Fe(CN)₆]⁴⁻, [Cu(NH₃)₄]²⁺, [Fe(CN)₆]³⁻,…NVAMediumJEE 2023
  39. 39Match List I with List II | List I (Coordination entity) | List II (Wavelength of light absorbed in nm) | |---|---| | (A) [CoCl(NH₃)₅]²⁺ |…MCQMediumJEE 2023
  40. 40Correct order of spin-only magnetic moment of the following complex ions is: (Given At. No. Fe: 26, Co: 27)MCQMediumJEE 2023
  41. 41Which of the following is the correct order of ligand field strength?MCQEasyJEE 2023
  42. 42Which of the following complex will show largest splitting of d-orbitals?MCQEasyJEE 2023
  43. 43The spin only magnetic moment of [Mn(H₂O)₆]²⁺ complexes is B.M. (Nearest integer) Given: Atomic no. of Mn is 25NVAEasyJEE 2023
  44. 44Which of the following complex is octahedral, diamagnetic and the most stable?MCQMediumJEE 2023
  45. 45The correct order of spin-only magnetic moments for the following complex ions is:MCQMediumJEE 2023
  46. 46The octahedral diamagnetic low spin complex among the following is:MCQEasyJEE 2023
  47. 47In potassium ferrocyanide, there are pairs of electrons in the t_2g set of orbitals.NVAEasyJEE 2023
  48. 48Match List I with List II | List I (Complex) | List II (Crystal Field splitting energy Δ₀) | |---|---| | (A) [Ti(H₂O)₆]²⁺ | (I) -1.2 | |…MCQMediumJEE 2023
  49. 49The correct order of the number of unpaired electrons in the given complexes is A. [Fe(CN)₆]³⁻ B. [FeF₆]³⁻ C. [CoF₆]³⁻ D. [Cr(oxalate)₃]³⁻…MCQMediumJEE 2023
  50. 50The ratio of spin-only magnetic moment values μ_eff[Cr(CN)₆]³⁻/μ_eff[Cr(H₂O)₆]³⁺ isMCQEasyJEE 2023
  51. 51The magnetic moment is measured in Bohr Magneton (BM). Spin only magnetic moment of Fe in [Fe(H₂O)₆]³⁺ and [Fe(CN)₆]³⁻ complexes…MCQEasyJEE 2023
  52. 52Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: [CoCl(NH₃)₅]²⁺ absorbs…MCQMediumJEE 2023
  53. 53Match List I with List II | List I (Complex) | List II (CFSE in Δ₀) | |---|---| | (A) [Cu(NH₃)₆]²⁺ | (I) -0.6 | | (B) [Ti(H₂O)₆]³⁺ | (II)…MCQMediumJEE 2023
  54. 54Which of the following complexes will exhibit maximum attraction to an applied magnetic field?MCQMediumJEE 2023
  55. 55The complex with highest magnitude of crystal field splitting energy (Δₒ) isMCQEasyJEE 2023
  56. 56The homoleptic and octahedral complex of Co²⁺ and H₂O has unpaired electron(s) in the t_2g set of orbitals.NVAEasyJEE 2023

Frequently asked questions

Our bank has 56 previous-year JEE Chemistry questions tagged to Crystal Field Theory, drawn from JEE papers between 2023 and 2026, including 14 from 2026 alone. Each comes with a full step-by-step solution.

Crystal Field Theory is rated Advanced overall for JEE Chemistry. The PYQs on this page break down as 31 medium, 25 easy.

Of the 56 previous-year questions on Crystal Field Theory, 43 are multiple-choice (MCQ) and 13 are numerical-value (NVA) questions.

Based on recent paper analysis, Crystal Field Theory is worth about 4 marks in JEE Main. It sits in Coordination Compounds, a Class 12 Chemistry chapter.

More Coordination Compounds topics

Ligands & Coordination Number29Isomerism in Coordination Compounds13Valence Bond Theory12Werner's Theory1

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