23. Indicate that which of the following electron transfer reactions is inner-sphere type? (A) [Cr(H₂O)₆]²⁺ + [Co(NH₃)₅Cl]²⁺ → (B) [Cr(bipy)₃]²⁺ + [Co(NH₃)₅Cl]²⁺ → (C) [Ru(NH₃)₆]²⁺ + [Co(NH₃)₅OH]²⁺ → (D) [Ru(NH₃)₆]²⁺ + [Co(NH₃)₅(H₂O)]²⁺ → (E) None of the above is correct.

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.

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