10. Which of the following electron configurations does not show single spin-allowed t₂g → eg transitions? (A) d¹ (B) d³ (high-spin) (C) d⁴ (low-spin) (D) d⁶ (high-spin) (E) d⁹

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.

10. Which of the following electron configurations does not show single spin-allowed t₂g → e_g transitions?
(A) d¹
(B) d³ (high-spin)
(C) d⁴ (low-spin)
(D) d⁶ (high-spin)
(E) d⁹

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