70. The value of the Bohr radius for hydrogen is:
(A)0.529 x 10^-6cm
(B) 0.529 x 10^-8cm
(C) 0.529 x 10^-10cm
(D) 0.529 x 10^-12 cm
(E) 0.529 x 10^-14 cm 

68. If the ionization energy of a hydrogen atom is 13.6 eV, the energy required to excite it from ground state to the next higher state is approximately: (A) 3.4eV(B)10.2eV(C)17.2eV(D)13.6eV(E)6.8 ev

66. According to the Bohr Model, please use the equation below and calculate the minimum energy required to remove the electron from a He+ ion in its first excited state. (A) 2.178 x 10-18 J (B) 5.445 x 10-19 J (C) 8.712 x 10-18 J (D) 4.356 x 10-18 J (E) 1.089 x 10-18 J

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 

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

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 

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