18. Which of the following complexes has the greatest thermodynamic stability (en = H₂N-CH₂CH₂-NH₂)? Note: assume a high-spin configuration for Mn in these complexes.
(A) [Mn(NH₃)₆]²⁺
(B) [Zn(NH₃)₆]²⁺
(C) [Mn(en)₃]²⁺
(D) [Zn(en)₃]²⁺

1. In a transition metal complex having Oh symmetry, which configurations in the followings can be classified as E? (A) t2g³ (B) t2g⁴eg² (C) t2g³ (D) t2g³eg³ (E) t2g⁶eg²

2. For a free ion with d² configuration determine the order of term energy levels: (A) ³P ＜ ¹S ＜ ¹D (B) ³P ＜ ¹D ＜ ¹S (C) ¹G ＜ ³P ＜ ¹D (D) ³P ＜ ¹D ＜ ³F (E) ³P ＜ ¹F ＜ ¹D

3. Which of the following salts has the highest lattice energy? (A) LiI (B) LiF (C) CsI (D) CsF

4. Both ZnS and CaF₂ have a face-centered cubic unit cell where the S²⁻ and Ca²⁺ ions are closest packed in each structure. Which of the following is true? (A) There are 4 tetrahedral holes empty in each structure. (B) In both compounds, one-half of the tetrahedral holes are filled. (C) In both compounds, all the tetrahedral holes are filled. (D) There are 8 Zn²⁺ ions and 4 F⁻ ions in the unit cell. (E) In ZnS, one-half of the tetrahedral holes are filled by Zn²⁺ ions, whereas in CaF₂ all the tetrahedral holes are filled with F⁻ ions.

5. If the radius of an atom is r, what is the length of the side of the body-centered cubic unit cell? (A) 4r/31/2 (B) 2.25r (C) r (D) 2r (E) 81/2r

6. Which of the followings is incorrect regarding applications of Tanabe-Sugano diagram? (A) Tanabe-Sugano diagrams can be used for both high-spin and low-spin complexes (B) Orgel diagrams apply only to high spin complexes (C) Based on Tanabe-Sugano diagram, the ground state of [Mn(H₂O)₆]²⁺(aq) is ⁶A₁ (D) The D₀ and B of a complex can be obtained by the absorption maxima from the spectra (E) According to Tanabe-Sugano diagram, [Cr(H₂O)₆]²⁺ generally shows two spin-allowed transitions.

7. Which of the followings is the consequence of selection rules in spectroscopy? (A) Complexes with d-d transition tend to show large extinction coefficient. (B) The optical transition observed in IrBr₆³⁻ is parity-forbidden. (C) Tetrahedral complexes have more intense absorption than octahedral complexes. (D) [Ti(H₂O)₆]³⁺ shows both spin- and Laporte-forbidden transitions.

8. Which of the following has the largest Δtet? (A) CrO₄²⁻ (B) MnO₄³⁻ (C) FeO₄²⁻ (D) RuO₄²⁻

9. What of the following complexes shows metal-to-ligand charge transfer (MLCT)? (A) [Fe(SCN)(H₂O)₅]²⁺ (B) [IrBr₆]³⁻ (C) [Cu(phen)₂]⁺ (D) [Cu(NH₃)₄]²⁺

10. Which of the following electron configurations does not show single spin-allowed t₂g → eg transitions? (A) d¹ (B) d³ (high-spin) (C) d⁴ (low-spin) (D) d⁶ (high-spin) (E) d⁹

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