7. Which of the followings is the consequence of selection rules in spectroscopy? (A) Complexes with d-d transition tend to show large extinction coefficient. (B) The optical transition observed in IrBr₆³⁻ is parity-forbidden. (C) Tetrahedral complexes have more intense absorption than octahedral complexes. (D) [Ti(H₂O)₆]³⁺ shows both spin- and Laporte-forbidden transitions.

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.

相關試題

相關試卷