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

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)

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

85. A tetracyclic compound, aldrin , was used as an insecticide. How many double bonds are presented in aldrin? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

86. Which of following structures presents the most stable conformation of cis-1-ethyl-2-isopropylcyclohexane? (A) (B) (C) (D) (E)