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

71. One mole of X(g) and one mole of Y(g) are mixed in a closed reactor in the presence of catalysts, and Z(g) is generated. The reaction is a X + b Y → c Z, where a, b, and c are the coefficients in the balanced equation. At a certain time, the mixture contains 1.8 moles of gases while the ratio of their partial pressures is PX:PY:PZ = 7:9:2. What are the values of a, b, and c? (A) a = 1, b = 2, c = 3 (B) a = 3, b = 1, c = 2 (C) a = 7, b = 9, c = 2 (D) a = 3, b = 1, c = 8 (E) a = 2, b = 9, c = 7

72. Consider an adiabatic and reversible expansion process from state I to state II. Which of the following statements is true? (A) P1V1 = P2V2 (B)(C) The final temperature will be higher than the initial temperature. (D) The final volume of the gas is much greater than the expansion were carried out isothermally. (E) The work delivered to the surrounding is much smaller than the expansion were carried out isothermally.

73. When a 1.00 mL of the M solution of organic acid is diluted with 9.00 mL of ether, forming solution A and then 2.00 mL of the solution A is diluted with 8.00 mL of ether, forming solution B. What is the concentration of solution B? (A) (B)(C) (D) (E)

74. What is the volume of O2(g) generated when 22.4 g of KClO3 is decomposed at 153°C under 0.820 atm? (KClO3: 122.55 g/mol) (A) 0.09 L (B) 3.00 L (C) 4.20 L (D) 7.79 L (E) 11.7 L

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)

79. Please choose the most stable cation? (A) I (B) II (C) III (D) IV (E) V

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.