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63. The reaction 2NO₂ → 2NO + O₂ obeys the rate law
at 400 K. If the initial concentration of NO₂ is 1.00 M, how long will it take for the [NO₂] to decrease to 0.25 M ?
(A) 50 s
(B) 100 s
(C) 200 s
(D) 300 s
(E) 600 s

59. A light of wavelength 400 nm falls on a metal surface having a work function 1.70 eV. What is the maximum kinetic energy of the photoelectrons emitted from the metal?( c = 3.00 × 108 m/s, h = 6.626 × 10-34 J●s , 1 eV = 1.60 × 10-19 J) (A) 4.52 eV (B) 3.11 eV (C) 2.82 eV (D) 1.70 eV (E) 1.41 eV

60. The Balmer series for the hydrogen atom corresponds to electronic transitions that terminate in the state with quantum number n = 2 as shown in the figure. Consider the photon of the longest wavelength corresponding to a transition shown. What is its wavelength?(A) 420 nm (B) 458 nm (C) 540 nm (D) 656 nm (E) 720 nm

61. Which structure is not considered to have aromaticity? (A)(B)(C)(D)(E)

62. Solid KF has a lattice energy of –804 kJ/mol and a heat of solution (in water) of –15 kJ/mol. RbF has a lattice energy of –768 kJ/mol and a heat of solution (in water) of –24 kJ/mol. Which salt forms stronger attractions with water? (A) KF, because it releases more heat during the formation of crystal. (B) KF, because it has a more negative heat of hydration. (C) RbF, because it releases more heat during the formation of crystal. (D) RbF, because it has a more negative heat of hydration. (E) Both salts have the same interactions with water.

64. Today’s automatic sunglasses utilize the following rearrangement reaction between A and B promoted by UV:However, infrared spectroscopy is often applied to differentiate A and B because of the strong and distinct absorption of _________ functional group.(A) arene (B) conjugated olefin (C) carbonyl (D) ether (E) amide

65. Water desalination is a method to solve the problem of drought resulting from climate change. What is the minimum pressure needed to purify the water from 0.05 M of NaCl(aq) by reverse osmosis at 27 °C? (R = 0.08206 L atm K-1 mol-1 ) (A) 1.23 atm (B) 2.46 atm (C) 3.71 atm (D) 4.52 atm (E) None of the above.

66. Consider the following reaction:A2 + B2 → 2AB       △H = –235 kJThe bond energy for A2 is half the amount of AB. The bond energy of B2 = 247 kJ/mol. What is the bond energy of A2? (A) 482 kJ/mol (B) 238 kJ/mol (C) 161 kJ/mol (D) –118 kJ/mol (E) –129 kJ/mol

67. Which statement is correct? (A) The bond order of He2 + is 1. (B) The bond order of Ne2 is 1. (C) The bond order of C2 + is 1. (D) N2 has a larger bond order than N2 2– . (E) None of the above.

68. You mix 265.0 mL of 1.20 M lead(II) nitrate with 300.0 mL of 1.55 M potassium iodide. Which of the followings is true? (A) Lead nitrate is the limited reagent. (B) The final concentration of Pb2+ ions is 0.56 M. (C) The final concentration of K+ is 0.823 M. (D) The final concentration of NO3 – is 0.823 M. (E) The final concentration of I– is 0.823 M.

69. Follow the balanced equation: N2(g) + 3H2(g) → 2NH3(g)An equal number of moles of nitrogen and hydrogen gases were added in a balloon. The volume of the balloon is 2.00 L before any reaction occurs. Determine the volume of the balloon after the reaction is complete, assuming constant temperature. (A) 0.67 L (B) 1.00 L (C) 1.33 L (D) 2.00 L (E) 4.00 L