47. What is the Mo-Mo bond order for [Mo₂(SO₄)₄]³⁻? (A) 2.5 (B) 3 (C) 3.5 (D) 4 (E) 5

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.

47. What is the Mo-Mo bond order for [Mo₂(SO₄)₄]³⁻?
(A) 2.5
(B) 3
(C) 3.5
(D) 4
(E) 5

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