Crystal Field Theory Quiz

In an octahedral complex, the d-orbitals split into which two sets?

• dx2-y2, dz2 and dxy, dxz and dyz

• t2g​ and eg

• π and σ

• dxy, dxz, dyz and dx2-y2, dz2

The magnitude of crystal field splitting energy (10Dq) depends on:

• Size of ligand only

• Geometry of the complex only

• Nature of metal ion and ligands

• Oxidation state of ligand

According to the spectrochemical series, which of the following ligands produces the strongest field?

• I⁻

• Cl⁻

• NH₃

• CN⁻

Which type of distortion is typically observed in an octahedral complex with uneven filling of the eg​ orbitals?

• Tetrahedral splitting

• Jahn-Teller distortion

• Ligand field collapse

• Racah distortion

In a tetrahedral complex, the d-orbitals split into which sets?

• eg above t2g

• t2g ​ above eg ​

• All five orbitals degenerate

• No splitting occurs

Which of the following is a high-spin complex?

• [Fe(CN)6]3−[Fe(CN)6]3-[Fe(CN)6​]3−

• [FeF6]3−[FeF6]3-[FeF6​]3−

• [Co(NH3)6]3+[Co(NH3)6]3+[Co(NH3​)6​]3+

• [Ni(CN)4]2−[Ni(CN)4]2-[Ni(CN)4​]2−

The 10Dq value is usually highest in which geometry?

• Tetrahedral

• Square planar

• Octahedral

• Linear

Which factor does not directly influence crystal field splitting?

• Metal ion oxidation state

• Number of ligands

• Temperature of the solution

• Ligand identity

In molecular orbital theory, which type of interaction stabilizes the complex?

• Anti-bonding π* orbitals

• Overlap of ligand σ orbitals with metal d-orbitals

• Non-bonding orbitals only

• Overlap of ligand lone pairs with ligand orbitals

In spinel structures, the site preference of metal ions is determined by:

• Atomic number of metal

• Ionic radius and crystal field stabilization energy

• Valency only

• Coordination number of ligands