73. The ground term of a free carbon atom is ,
(A)¹S
(B)²S
(C)¹P
(D)³P
(E) none of the above

74. Among the following compounds, which has the hi^iest C-0 stretching frequency? (A) [Ti(CO)6]2- (B) [V(CO)6]- (C)[Cr(CO)6] (D) [Mn(CO)6]+ (E) [Fe(CO)6]2+

75. How many C–O stretching bands does Jac-Mo(CO)3(PF3)3 give in its IR spectrum? (A) 0 (B) 1 (C) 2 (D) 3 (E) none of the above

76. Which of the following elements plays an important role in Suzuki coupling reactions? (A)Ag (B)B (C)Cu (D) Sn (E)Zn

77. Which of the following is the most representative element in Wilkinson's hydrogenation catalyst? (A)Fe (B)Co (C)Ni (D)Pd (E)Rh

78. The activation energy for reaction H2(g) + l2(g) →2 HI(g) is changed from 184 kJ/mol to5 9 kJ/mol at 600 K by the introduction of a Pt catalyst. Calculate the value of the ratio rate(catalyzed)/rate(uncatalyzed). (A) 1.00 (B) 0.32 (C) 2.58 (D) 7.6x10】° (E) none of the above

79. At a particular temperature, the half-life of a zero-order reaction is 29.0 min. How long will it take for the reactant concentration to deplete to 1/8 of the initial concentration? (A) 87.0 min (B) 58.0 min (C) 50.8 min (D) 232 min (E) 203 min

80. The reaction, 2H2O(g) — 2H2(g) + O2(g), has a positive value for △G°. Which of tfie following statements must be true? (A) The reaction is slow. (B) The reaction will not occur. That is, when H2O(g) is introduced into a flask, no O2 or H2 will fonn even over a long period of time. (C) The equilibrium lies far to the right. (D) The reaction is exothermic. (E) None of these are true.

81. Why does the pH value afiect the separation of amino acids by electrophoresis? Please choose tiie wrong reason. (A) Amino acids exist as zwitterions. (B) At low pH values, the amino acid molecules will be strongly attracted to the negative electrode. (C) At high pH values, the amino add molecules will be strongly attracted to the negative electrode. (D) In basic solution, the net chaise is negative due to die dissociation of the carboxylic acid groups. (E) None of the above.

82. What is a virtual state in Raman spectroscopy? Please choose the correct description. (A) It helps us to visualize both elastic and inelastic scattering processes. (B) It lies between the ground state and a vibrational state of tfie molecule. (C) It is also a first vibrational state. (D) It is a real electronic energy state. (E) None of die above.

83. Sort the following compounds in decreasing order by their pKa valuesCfrom highest to lowest). (A) I＞Ⅱ＞Ⅲ＞Ⅳ(B) IV＞Ⅲ＞Ⅱ＞I(C)IV＞Ⅱ＞Ⅲ＞I (D)Ⅲ＞I＞Ⅱ＞IV(E)I＞Ⅲ＞Ⅱ＞I

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