13. Which of the following complexes do you expect to be kinetically inert? (A) [CoCl₄]²⁻ (B) [ZnCl₄]²⁻ (C) [CrCl₆]³⁻ (D) [TiCl₆]³⁻

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.

13. Which of the following complexes do you expect to be kinetically inert?
(A) [CoCl₄]²⁻
(B) [ZnCl₄]²⁻
(C) [CrCl₆]³⁻
(D) [TiCl₆]³⁻

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