1. Which of the following ligands produces the largest crystal field splitting energy (Δ₀)?
A. Br⁻
B. H₂O
C. NH₃
D. CN⁻
2. Which of the following is classified as a π-donor ligand?
A. CO
B. CN⁻
C. Cl⁻
D. phen
3. In an octahedral complex, what is the relative energy of the t₂g orbitals?
A. Higher than eg
B. Lower than eg
C. Equal to eg
D. Higher than s orbitals
4. How does the Δ₀ value of [Fe(H₂O)₆]³⁺ compare to that of [Fe(H₂O)₆]²⁺?
A. Smaller
B. Equal
C. Larger
D. Cannot be determined
5. Which of the following metal ions is most likely to form a low-spin complex (with same ligand)?
A. Mn²⁺
B. Fe²⁺
C. Co³⁺
D. Ni²⁺
6. Which orbitals are involved in the calculation of Crystal Field Stabilization Energy (CFSE)?
A. s orbitals
B. p orbitals
C. t₂g and eg orbitals
D. f orbitals
7. Which geometry generally results in the smallest crystal field splitting energy?
A. Octahedral
B. Tetrahedral
C. Square planar
D. Trigonal bipyramidal
8. Which of the following ligands exhibits π-acceptor character?
A. H₂O
B. F⁻
C. CO
D. OH⁻
9. Which ligand lies at the weak-field end of the spectrochemical series?
A. I⁻
B. NH₃
C. en
D. NO₂⁻
10. How does the crystal field splitting energy Δ₀ depend on the metal-ligand distance (l)?
A. Directly proportional to l
B. Inversely proportional to l²
C. Inversely proportional to l⁵
D. No relationship
Answer.
DCBCC CBCAC