30. Following Q 29, the Cl-I-Cl bond angle in I(CF₃)Cl₂ would be close to (A) 60° (B) 90° (C) 109° (D) 120° (E) 180°

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.

30. Following Q 29, the Cl-I-Cl bond angle in I(CF₃)Cl₂ would be close to
(A) 60°
(B) 90°
(C) 109°
(D) 120°
(E) 180°

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