79. Please choose the most stable cation?

(A) I
(B) II
(C) III
(D) IV
(E) V

75. What is the appropriate representation of the repeating unit of the following polymer? (A) I (B) II (C) III (D) IV (E) V

76. Which of the following structures is the major form of the lysine at the pH = 14? (A) I (B) II (C) III (D) IV (E) V

77. Which of the followings is a correct set of quantum numbers for an electron in a 3d orbital? (A) n = 3, l = 0, ml = -1 (B) n = 3, l = 1, ml = 3 (C) n = 3, l = 2, ml = 3 (D) n = 3, l = 3, ml = 2 (E) n = 3, l = 2, ml = -2

78. Which of the following complexes will absorb visible radiation of the shortest wavelength? (A) (B)(C)(D)(E)

80. Which of the following statements about “The Bohr Model” and “Particle in a Box” is TRUE? (A) For an electron trapped in a one-dimensional box, as the length of the box increases, the spacing between energy levels will increase. (B) The total probability of finding a particle in a one-dimensional box (length is L) in energy level n = 4 between x = L/4 and x = L/2 is 50%. (C) If the wavelength of light necessary to promote an electron from the ground state to the first excited state is λ in a one-dimensional box, then the wavelength of light necessary to promote an electron from the first excited state to the third excited state will be 3λ. (D) A function of the type A cos(Lx) can be an appropriate solution for the particle in a onedimensional box. (E) Assume that a hydrogen atom’s electron has been excited to the n = 5 level. When this excited atom loses energy, 10 different wavelengths of light can be emitted.

81. Which of the following statements concerning a face-centered cubic unit cell and the corresponding lattice, made up of identical atoms, is incorrect? (A) The coordination number of the atoms in the lattice is 8. (B) The packing in this lattice is more efficient than for a body-centered cubic system. (C) If the atoms have radius r, then the length of the cube edge is (D) There are four atoms per unit cell in this type of packing. (E) The packing efficiency in this lattice and hexagonal close packing are the same.

82. Which of the followings will give a solution with a pH ＞ 7, but is not an Arrhenius base in the strict sense? (A) CH3NH2 (B) NaOH (C) CO2 (D) Ca(OH)2 (E) CH4

83. Pentane, , boils at 35°C. Which of the followings is true about kinetic energy, Ek, and potential energy, Ep, when liquid pentane at 35°C is compared with pentane vapor at 35°C? (A) Ek(g) ＜ Ek(l)； Ep(g) ≈ Ep(l) (B) Ek(g) ＞ Ek(l)； Ep(g) ≈ Ep(l) (C) Ep(g) ＜ Ep(l)； Ek(g) ≈ Ek(l) (D) Ep(g) ＞ Ep(l)； Ek(g) ≈ Ek(l) (E) Ep(g) ≈ Ep(l)； Ek(g) ≈ Ek(l)

84. Five molecules are shown as below. Which one has the highest ionic strength? (A) B(OH)3 (B) HNO3 (C) Na2HPO4 (D) CaCO3 (E) BaSO4

85. Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass % O. Determine its empirical formula. (A) HNO (B) H2NO2 (C) (D)(E) H2NO3