50. The reaction between SbF₄ and two equivalents of HF leads to the formation of (A) SbF₃ + H₂ + 2F₂ (B) [SbF₆]⁻[H₂F]⁺ (C) HSbF₂ + 3F₂ (D) H₂SbF₃⁺ 2F₂ (E) [SbF₄]⁺[HF₂]⁻

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.

50. The reaction between SbF₄ and two equivalents of HF leads to the formation of
(A) SbF₃ + H₂ + 2F₂
(B) [SbF₆]⁻[H₂F]⁺
(C) HSbF₂ + 3F₂
(D) H₂SbF₃⁺ 2F₂
(E) [SbF₄]⁺[HF₂]⁻

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