64. Of the following eleven compounds, how many of them have aromatic character?
(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

60. The radioactive isotope  226Ra decays to 222 Rn with a half-life of 1600 years. The radioactive isotope  238U decays to234 Th  with a half-life of 4.5× 109 years. What is the ratio of the decay rate of 1 g  226Ra to that of 10 g238 U  ? (A) 3.0 × 106 (B) 3.0 × 10-7 (C) 3.0 × 105 (D) 3.0 × 10-6 (E) 3.0 × 107

61. Which of the following solution has shown the correct titration curve? (A) NH3 (B) CO3 2- (C) HCN (D) PO43- (E) NaOH

62. Cisplatin cis-[PtCl2(NH3)2] has been applied as an anti-tumor drug. What is its main interaction in vivo? (A) Binding with DNA. (B) Binding with lipid. (C) Binding with protein. (D) Binding with sugar. (E) Blocking ion absorption.

63. A chemist needs to prepare a buffered solution using one of the following acids (and its sodium salt): HA (Ka = 1.4 × 10-3 ), HB (Ka = 9.8 × 10-6 ), HC (Ka = 8.4 × 10-5 ), HD (Ka = 3.5 × 10-7 ), HE (Ka = 1.9 × 10-8 ). To prepare a solution buffered at pH = 5.10, which system will work best (a buffer with the best capacity)? (A) HA and its sodium salt (B) HB and its sodium salt (C) HC and its sodium salt (D) HD and its sodium salt (E) HE and its sodium salt

65. Which of the following species has the lowest dissociation energy? (A) O2 (B) O2 – (C) O2 2– (D) O2+ (E) O2 2+

66. According to the Bohr Model, please use the equation below and calculate the minimum energy required to remove the electron from a He+ ion in its first excited state. (A) 2.178 x 10-18 J (B) 5.445 x 10-19 J (C) 8.712 x 10-18 J (D) 4.356 x 10-18 J (E) 1.089 x 10-18 J

67. About the atomic orbitals, which of the following statements is incorrect? (A) In a polyelectronic atom, the orbital relative energies are E3s < E3p < E3d. (B) In H atom, energy is absorbed and electron jumps from 1s to 3s orbital. (C) The 2p orbital is spherically symmetric. (D) The square of the wave function is indicated as a probability distribution. (E) None of the above.

複選題68. NF3 has a bond angle of 102.5º, while PF3 has a bond angle of 96.3º. What is the best explanation for the larger bond angle in NF3? (A) The nitrogen 2s orbital participates more in bonding than the phosphorus 3s orbital does. (B) Nitrogen is more electronegative than phosphorus. (C) NF3 has no unpaired electrons while PF3 has two unpaired electrons. (D) NF3 is an ionic compound while PF3 forms covalent bonds. (E) NF3 adopts a trigonal geometry, while PF3 displays a trigonal planar configuration.

69. When the reaction below is at equilibrium, what is the temperature? 2 NO(g) + O2(g) → 2 NO2(g) ΔH°rxn = –113 kJ•mol–1 S°rxn = –145 J•mol–1 •K–1 (A) –195 °C (B) 77.9 °C (C) 350.9 °C (D) 506 °C (E) 779 °C

70. Please balance the following equation (o, p, q, x, y, z are reaction coefficients). What is the sum of all coefficients (o + p + q + x + y + z) ? (A) 18 (B) 20 (C) 22 (D) 24 (E) 26