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.

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

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

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

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.

82. Which of the labeled C-H bond is the weakest? (A) I (B) II (C) III (D) IV (E) V

83. Which of the following alkenes generates the greatest heat upon hydrogenation? (A) 1,3-pentadine (B) 1,4-pentadiene (C) 1,3-butadiene (D) cis-2-pentene (E) trans-2-pentene

84. What is the structural relationship of the following two compounds? (A) not isomers (B) conformational isomers (C) cis-trans isomers (D) structural isomers (E) both conformational isomers and structural isomers