14. The following complexes are formed upon reaction of [Ni(H₂O)₆]²⁺ with the corresponding ligand(s) in water. For which complex do you expect the greatest positive entropy change (ΔS) in the corresponding complex formation reaction? (A) [Ni(NH₃)₆]²⁺ (B) [Ni(en)(NH₃)₄]²⁺ (C) [Ni(en)₃]²⁺ (D) [Ni(en)₂(NH₃)₂]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.

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