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⁺

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.

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⁺

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