Crystal Field Theory: JEE Questions & Solutions

Given 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…

Given below are two statements: Statement I: Crystal Field Stabilization Energy (CFSE) of [Cr(H₂O)₆]²⁺ is greater than that of…

Identify 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…

Consider the transition metal ions Mn³⁺, Cr³⁺, Fe³⁺ and Co³⁺ and all form low spin octahedral complexes. The correct decreasing order of…

[Ni(PPh₃)₂Cl₂] is a paramagnetic complex. Identify the INCORRECT statements about this complex. A. The complex exhibits geometrical…

Given below are two statements: Statement I: [CoBr₄]²⁻ ion will absorb light of lower energy than [CoCl₄]²⁻ ion. Statement II: In [CoI₄]²⁻…

The statements that are incorrect about the nickel(II) complex of dimethylglyoxime are: A. It is red in colour. B. It has a high solubility…

The 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 ≫…

Total 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…

Given below are two statements: Statement I: The number of paramagnetic species among [CoF₆]³⁻, [TiF₆]³⁻, V₂O₅ and [Fe(CN)₆]³⁻ is 3.…

The 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),…

The correct statement among the following is:

The 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…

The number of isoelectronic species among Sc³⁺, Cr²⁺, Mn³⁺, Co³⁺ and Fe³⁺ is ‘n’. If ‘n’ moles of AgCl is formed during the reaction of…

In which of the following complexes the CFSE, Δ₀ will be equal to zero?

From the magnetic behaviour of [NiCl₄]²⁻ (paramagnetic) and [Ni(CO)₄] (diamagnetic), choose the correct geometry and oxidation state.

The correct order of the following complexes in terms of their crystal field stabilization energies is:

The d-electronic configuration of an octahedral Co(II) complex having a magnetic moment of 3.95 BM is:

The conditions and consequences that favour the t_2g³ e_g¹ configuration in a metal complex are:

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet color in non-luminous…

Total number of molecules/species from the following which will be paramagnetic is. O₂, O₂⁺, O₂⁻, NO, NO₂, CO, K₂[NiCl₄], [Co(NH₃)₆]Cl₃,…

The correct increasing order of stability of the complexes based on Δₒ value is: (I) [Mn(CN)₆]³⁻    (II) [Co(CN)₆]⁴⁻ (III)…

Consider 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…

Given below are two statements: Statement I: In octahedral complexes, when Δₒ < P high spin complexes are formed. When Δₒ > P low spin…

A 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…

The 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…

Identify 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…

Which one of the following complexes will have Δ₀=0 and μ=5.96 B.M.?

The 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:

‘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…

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively: [Fe(CN)₆]³⁻,…

The 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…

Match 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⁻…

Consider 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…

The 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…

The correct statements from the following are: A. The strength of anionic ligands can be explained by crystal field theory. B. Valence bond…

Which of the following cannot be explained by crystal field theory?

The 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⁻,…

Match List I with List II | List I (Coordination entity) | List II (Wavelength of light absorbed in nm) | |---|---| | (A) [CoCl(NH₃)₅]²⁺ |…

Correct order of spin-only magnetic moment of the following complex ions is: (Given At. No. Fe: 26, Co: 27)

Which of the following is the correct order of ligand field strength?

Which of the following complex will show largest splitting of d-orbitals?

The spin only magnetic moment of [Mn(H₂O)₆]²⁺ complexes is B.M. (Nearest integer) Given: Atomic no. of Mn is 25

Which of the following complex is octahedral, diamagnetic and the most stable?

The correct order of spin-only magnetic moments for the following complex ions is:

The octahedral diamagnetic low spin complex among the following is:

In potassium ferrocyanide, there are pairs of electrons in the t_2g set of orbitals.

Match List I with List II | List I (Complex) | List II (Crystal Field splitting energy Δ₀) | |---|---| | (A) [Ti(H₂O)₆]²⁺ | (I) -1.2 | |…

The 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⁻…

The ratio of spin-only magnetic moment values μ_eff[Cr(CN)₆]³⁻/μ_eff[Cr(H₂O)₆]³⁺ is

The 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…

Given 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…

Match 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)…

Which of the following complexes will exhibit maximum attraction to an applied magnetic field?

The complex with highest magnitude of crystal field splitting energy (Δₒ) is

The homoleptic and octahedral complex of Co²⁺ and H₂O has unpaired electron(s) in the t_2g set of orbitals.