31. Consider SF₆ molecule, what is the bond order for each S-F bond if only 3s and 3p valence shell of S are considered in forming bonds with F? (A) 1/3 (B) 2/3 (C) 1/2 (D) 1 (E) 3/2

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.

31. Consider SF₆ molecule, what is the bond order for each S-F bond if only 3s and 3p valence shell of S are considered in forming bonds with F?
(A) 1/3
(B) 2/3
(C) 1/2
(D) 1
(E) 3/2

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