75. What is the point group of triphenylphosphine?
(A)
(B) D₃
(C)
(D) C₃
(E)

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

73. Consider the following reaction at equilibrium. Which change will cause the equilibrium to shift to the left?  2NOBr(g) ⇌ 2NO(g) + Br2(g), = +30 kJ/mol (A) Increase the container volume (B) Remove some NO (C) Decrease the temperature (D) Add more NOBr (E) Increase the temperature

74. How many of the following will raise the pH of a weak acid HA in aqueous solution?I. Addition of water.II. Making a buffered solution by adding NaA(s).III. Addition of NaCl(s).IV. Addition of HNO3.V. Titrating with KOH.(A) 5 (B) 4 (C) 3 (D) 2 (E) 1

76. Consider a galvanic cell based on the following reactions:   What is the value of ∆Go? (A) -84 kJ (B) -373 kJ (C) -746 kJ (D) -1120 kJ (E) -2240 kJ

77. What type of radioactive process would be expected in the following reaction? (A) α particle production (B) β particle production (C) positron production (D) γ ray production (E) electron capture

78. Which of the following complexes can exhibit optical isomerism? (A) cis-Co(NH3)4Cl2 (B) trans-Co(en)2Br2 (C) cis-Co(en)2Cl2 (D) Co(NH3)3Cl3 (E) None of the above.

79. Which one of the following is paramagnetic? (A) (B) (C)(D) (E)

80. A formula of a certain compound is [M(NH3)5Cl]Cl2, where the M is a type of metal. The metal ion has 24 electrons in this complex. Determine the identity of the metal. (A) Mn (B) Fe (C) Co (D) Ni (E) Cu

81. Two well-known complex ions containing Ni are , which is green, and , which is purple. Which one of the following statements is true? (A) The crystal field splitting energy (△) is greater for than for . (B) absorbs energy in the red region of the spectrum. (C) Both complex ions are diamagnetic. (D) transmits light with wavelengths of approximately 650–700 nm. (E) The green complex absorbs green light.