75. What factors affect the ionization energy of an atom?
(A) Electron shielding
(B) Electron configuration
(C) Nuclear charge
(D) All of the above
(E) None of the above

71 . Select the rate law that corresponds to the data shown for the following reaction: A+B→ Products [X]0 represents the initial concentration for a species X.(A) Rate = k[A]3 (B) Rate = k[A]2[B]1 (C) Rate = k[A]1[B]2 (D) Rate = k[B]3 (E) None of the above

72. Which one of the following tetrahedral MXF- complexes has the strongest crystal field stabilization? (A) FeCl42- (B) MnCl42- (C) CoCl42- (D) NiCI42- (E) CuCI42- 

73. Although the peroxide ion, O22-, and the acetylide ion. C22-, have long been known. the diazenide ion N22- has only been prepared in 2001. By comparison with the other diatomic species, N2 and O2, what is the bond order and number of unpaired electrons for N22-, respectively? (A)1,1 (B)3.1 (C)2.1 (D)2.0 (E) 2.2

74. Calculate the reduced mass of HF molecule given that the mass of H atom is 1 amu and the mass of F atom is 19 amu. Note: assume 1 amu = 20 mg. (A) 18mg (B) 19mg (C) 20mg (D) 21 mg (E) 22 mg 

76. How can we explain the fact that CCl4 is a liquid and CL. is a solid at 25℃? Which of the following options is the best explanation? (A) CCl4 has a larger dipole moment than Cl4 due to the higher electronegativity of CI compared to I. (B) Cl4 has a larger dipole moment than CCl4 because there is stronger electron repulsion in the Cl-I bonds than in the C-CI bonds. (C) London dispersion forces are stronger in C Cl4 than in  Cl4 because Cl is more electronegative than I. (D) London dispersion forces are stronger in  Cl4 than in C Cl4 because  Cl4 has a more easily polarizable electron cloud. (E) None of the above. 

77. How many microstates does a s1d1 electron configuration have? (A)5(B)10 (C)15 (D) 20 (E) 25

78. The most probable distribution function for a system of molecules is given by (A) Maxwell-Boltzmann distribution (B) Fermi-Dirac distribution (C) Bose-Einstein distribution (D) All of the above (E) None of the above 

79. What is the oxidation state of the terminal nitrogen atom in azide ions? (A)-3 (B)-1 (C)+1 (D) +4 (E)+5 

80. What is the highest occupied molecular orbital of a C24- ion? (A)σ2s* (B) π2p (C) σ2p(D)π2p* (E) σ2p*

81. On the basis of VSEPR, what is the predicted point group for XeO2F2? (A)Ci (B) Cs (C)C2v (D) C4v (E) D3h