25. Which of the following is INCORRECT regarding the M-N-O conformation in metal nitrosyl complexes? (A) The M-N-O angle can strongly deviate from 180° when back-bonding is less important. (B) Linear NO complex has a lower IR vibrational frequency in most cases. (C) The complex trans-[Co(en)₂(NO)Cl]² adopts a bent NO ligand geometry. (D) The [Fe(CN)₅(NO)]²⁻ adopts a linear NO ligand geometry.

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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