28. Following Q 27, what would be the possible spin states for this complex? (A) 0 and 1; (B) 0 and 1/2; (C) 1 and 2; (D) 1/2 and 3/2; (E) 3/2 and 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.

28. Following Q 27, what would be the possible spin states for this complex?
(A) 0 and 1;
(B) 0 and 1/2;
(C) 1 and 2;
(D) 1/2 and 3/2;
(E) 3/2 and 2.

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