38. Following Q37, triplet carbene (CH₂) has two unpaired electrons and it can adopt either a bent or linear geometry, which would you predict is more stable? (A) Bent (B) Linear (C) Both have the same stability

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.

38. Following Q37, triplet carbene (CH₂) has two unpaired electrons and it can adopt either a bent or linear geometry, which would you predict is more stable?
(A) Bent
(B) Linear
(C) Both have the same stability

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