85. Which of the following species is diamagnetic?
(A) CN
(B) B₂
(C) O₂
(D) All of the above.
(E) None of the above.

65. Which species has the highest bond order? (A) NO+ (B) O2 (C) O2 − (D) O2 2− (E) NO−

8. 波函數表示 HeH+的一個反鍵(anti-bonding)軌域，其中 (A) c1 > c2 (B) c1 = c2 = 1/ (C) c1 < c2 (D) 以上皆非

83. What is the highest molecular orbital degeneracy of cyclic H3+? (A)0(B)1 (C)2 (D)3 (E)4

28. 依據分子軌域理論，基態 CO 分子的 LUMO 為？ (A) 鍵結σ軌域 (B) 鍵結π軌域 (C) 反鍵結σ軌域 (D) 反鍵結π軌域 (E) 非鍵結軌域

86. Which of the lines in the figure below is the best representation of the relationship between the volume of a gas and its pressure, other factors remaining constant? (A) a (B) b (C) c (D) d (E) e

87. Sulfur tetrafluoride adopts a see-saw geometry with two axial F atoms with a F–S–F angle of about 180º and two equatorial F atoms at about 90º from the axial fluorines. Which statement most accurately describes the axial and equatorial S–F bonds? (A) The axial S–F bonds are longer because the two fluorine atoms must share bonding to the same orbital on sulfur. (B) The axial S–F bonds are longer because they experience greater repulsion from the other fluorine atoms in the molecule. (C) The equatorial S–F bonds are longer because the equatorial F–S–F bond angle is the smallest in the molecule. (D) The equatorial S–F bonds are longer because they experience greater repulsion from the lone pair on sulfur. (E) The equatorial S–F bonds are longer because they experience greater repulsion from two axial fluorine atoms.

88. According to the Haber-Bosch process, which statement is true? (A) The reaction to produce NH3 from H2 and N2 is reversible. (B) According to the Le Châtelier’s principle, the overall reaction is favorable to produce products in the state of high pressure. (C) Increasing the reaction temperature can accelerate the reaction to equilibrium. (D) Using Fe as a catalyst can accelerate the reaction to equilibrium, but cannot change the equilibrium between the reagents and products. (E) All statement are true.

89. A sample of a washing powder that contains a mixture of Na2CO3 and NaHCO3 is titrated with aqueous HCl and the following result is obtained: What is the mole ratio of CO32– to HCO3– in the washing powder? (A) 2 mole CO32– : 1 mole HCO3– (B) 1 mole CO32– : 1 mole HCO3– (C) 1 mole CO32– : 2 mole HCO3– (D) 1 mole CO32– : 3 mole HCO3– (E) 3 mole CO32– : 1 mole HCO3–(一律送分)

90. A student gave a molecule the following name:2-methyl-4-t-butylpentane However, the teacher pointed out that, although the molecule could be correctly drawn from this name, the name violates the IUPAC rules. What is the correct (IUPAC) name of the molecule? (A) 2-t-butyl-4-methylpentane (B) 2,4,5,5-tetramethylhexane (C) 1-sec-butyl-1,2,2-trimethylpentane (D) 2-t-butyl-4-iso-propylbutane (E) None of the above.

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