64. What is the hybridization of the central carbon atom of allene (H₂C=C=CH₂)?
(A) sp
(B) sp²
(C) sp³
(D) dsp³
(E) d² sp³

22. What are the hybridization state and geometry of the nitrogen atom in the following chemical structure?  (A) sp hybridized and linear geometry (B) sp2 hybridized and trigonal pyramidal (C) sp3 hybridized and trigonal pyramidal (D) sp3 hybridized and trigonal planar (E) sp3 hybridized and bent

20. Determine the hybridization of Cl in . (A) sp (B) sp2 (C) sp3 (D) dsp3 (E) d2sp3

65. How many of the following molecules have all of their atoms in the same plane? H2C=CH2, H2C=C=CH2, CH3COCH3, NH3, CO2, BeCl2 (A) 2 (B) 3 (C) 4 (D) 5 (E) 6

66. Which of these species, , should be paramagnetic? (A) and (B) and O2 (C) O2 and (D) only O2 (E) All three are paramagnetic.

67. Based on the molecular orbital theory, which of the following molecules has the strongest bond? (A) (B) NO (C) (D) (E) All the above molecules have the same bond strength.

68. Which of the following molecules has the smallest bond angle? (A) CH4 (B) SiH4 (C) NH3 (D) H2O (E) H2S

69. Which of the following statements is false? (A) The layering in a hexagonal closest-packed structure is aba. (B) A body-centered cubic unit cell has two atoms per unit cell. (C) For unit cells having the same edge length, a simple cubic structure would have a smaller density than a body-centered cube. (D) The size of tetrahedral hole is always larger than the size of octahedral hole. (E) Atoms in a solid, consisting of only one element would have six nearest neighbors if the crystal structure was a simple cubic array.

70. Rank the following compounds in the order from the highest boiling point to the lowest boiling point. (a) C2H5OC2H5 (b) CH3OH (c) HCONH2 (d) HCOOH (A) (b) ＞ (a) ＞ (c) ＞ (d) (B) (b) ＞ (a) ＞ (d) ＞ (c) (C) (c) ＞ (d) ＞ (b) ＞ (a) (D) (d) ＞ (c) ＞ (b) ＞ (a) (E) (b) ＞ (d) ＞ (a) ＞ (c)

71. The reaction “A + 2B → 2 C” exhibits the rate law as following: Rate = k [A][B] 2 Which of the following mechanisms could be consistent with this rate law? (A) A + 2B → D (fast), D → 2 C (slow) (B) 2B → D (fast), D + A → 2 C (slow) (C) 2B → D (slow), A + D → E (fast), E → 2 C (fast) (D) A + B ⇌ D (fast equilibrium), B + D → 2 C (slow) (E) B ⇌ 2 D (fast equilibrium), D + A → C (slow)

72. Consider the following reaction: N2(g) + 3 H2(g) ⇌ 2 NH3(g), equilibrium constant (K) = Predict the reaction direction of the following cases: (A) a. No shift； b. shift to left； c. shift to right (B) a. No shift； b. shift to right； c. shift to left (C) a. Shift to right； b. shift to left； c. no shift (D) a. Shift to left； b. shift to right； c. shift to right (E) a. Shift to left； b. shift to right； c. shift to left

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