67. According to molecular orbital, which of the following molecules is diamagnetic?
(A) HF
(B) O₂
(C) NO
(D)
(E)

68. Consider the figure, which shows ΔG° for a chemical process plotted against absolute temperature. Which of the following is an incorrect conclusion, based on the information in the diagram? (A) ΔH° ＞ 0 (B) ΔS° ＞ 0 (C) The reaction is spontaneous at high temperatures. (D) ΔS° increases with temperature while ΔH° remains constant. (E) There exists a certain temperature at which ΔH° = TΔS°.

69. Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbonoxygen double bond. Calculate the enthalpy of reaction using the bond energies given.  (A) -484 kJ (B) -366 kJ (C) -48 kJ (D) +48 kJ (E) +366 kJ

70. How many of the following molecules exhibit resonance: , O2F2? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

71. One mole of X(g) and one mole of Y(g) are mixed in a closed reactor in the presence of catalysts, and Z(g) is generated. The reaction is a X + b Y → c Z, where a, b, and c are the coefficients in the balanced equation. At a certain time, the mixture contains 1.8 moles of gases while the ratio of their partial pressures is PX:PY:PZ = 7:9:2. What are the values of a, b, and c? (A) a = 1, b = 2, c = 3 (B) a = 3, b = 1, c = 2 (C) a = 7, b = 9, c = 2 (D) a = 3, b = 1, c = 8 (E) a = 2, b = 9, c = 7

72. Consider an adiabatic and reversible expansion process from state I to state II. Which of the following statements is true? (A) P1V1 = P2V2 (B)(C) The final temperature will be higher than the initial temperature. (D) The final volume of the gas is much greater than the expansion were carried out isothermally. (E) The work delivered to the surrounding is much smaller than the expansion were carried out isothermally.

73. When a 1.00 mL of the M solution of organic acid is diluted with 9.00 mL of ether, forming solution A and then 2.00 mL of the solution A is diluted with 8.00 mL of ether, forming solution B. What is the concentration of solution B? (A) (B)(C) (D) (E)

74. What is the volume of O2(g) generated when 22.4 g of KClO3 is decomposed at 153°C under 0.820 atm? (KClO3: 122.55 g/mol) (A) 0.09 L (B) 3.00 L (C) 4.20 L (D) 7.79 L (E) 11.7 L

75. What is the appropriate representation of the repeating unit of the following polymer? (A) I (B) II (C) III (D) IV (E) V

76. Which of the following structures is the major form of the lysine at the pH = 14? (A) I (B) II (C) III (D) IV (E) V

77. Which of the followings is a correct set of quantum numbers for an electron in a 3d orbital? (A) n = 3, l = 0, ml = -1 (B) n = 3, l = 1, ml = 3 (C) n = 3, l = 2, ml = 3 (D) n = 3, l = 3, ml = 2 (E) n = 3, l = 2, ml = -2

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