14. According to molecular orbital (MO) theory, the twelve outermost electrons in the O2 molecule are distributed as follows:
(A) 12 in bonding MOs, 0 in antibonding MOs.
(B) 10 in bonding MOs, 2 in antibonding MOs.
(C) 9 in bonding MOs, 3 in antibonding MOs.
(D) 8 in bonding MOs, 4 in antibonding MOs.
(E) 7 in bonding MOs, 5 in antibonding MOs.

15. Which of the following statements relating to molecular orbital (MO) theory is incorrect? (A) Combination of two atomic orbitals produces one bonding and one antibonding MO. (B) A bonding MO is lower in energy than the two atomic orbitals from which it is formed. (C) Combination of two 2p orbitals may result in either σ or π MOs. (D) A species with a bond order of zero will not be stable. (E) In a stable molecule having an even number of electrons, all electrons must be paired. 第 1 頁，共 3 頁

16. One can safely assume that the 3s- and 3p-orbitals will form molecular orbitals similar to those formed when 2s- and 2p-orbitals interact. According to molecular orbital theory, what will be the bond order for the Cl2+ ion? (A) 0.5 (B) 1 (C) 1.5 (D) 2 (E) None of these choices is correct.

17. Consider three 1-L flasks at STP. Flask A contains NH3 gas, flask B contains NO2 gas, and flask C contains N2 gas. Which contains the largest number of molecules? (A) Flask A (B) Flask B (C) Flask C (D) All are the same (E) None of these choices is correct.

18. In which flask are the molecules least polar and therefore most ideal in behavior? (A) Flask A (B) Flask B (C) Flask C (D) All are the same (E) None of these choices is correct.

19. For which of the following species are the intermolecular interactions entirely due to dispersion forces? (A) C2H6 (B) CH3OCH3 (C) NO2 (D) H2S

20. Which of the following liquids would have the highest viscosity at 25°C? (A) CH3OCH3 (B) C2H5OH (C) CH3Br (D) HOCH2CH2OH

21. A 15.00 % by mass solution of lactose (C12H22O11, 342.30 g/mol) in water has a density of 1.0602 g/mL at 20°C. What is the molarity of this solution? (A) 0.03097 M (B) 0.4133 M (C) 0.4646 M (D) 1.590 M (E) 1.379 M

22. Which of the following systems possesses the lowest freezing point? (A) 0.1 M FeCl3(aq) (B) 0.1 M K2SO4(aq) (C) 0.1 M CaCl2(aq) (D) 0.3 M C6H12O6, glucose (E) 0.1 M NaCl

23. For a particular process q = 20 kJ and w = 15 kJ. Which of the following statements is true? (A) Heat flows from the system to the surroundings. (B) The system does work on the surroundings. (C) E = 35 kJ (D) All of the above are true. (E) None of these choices is correct.

24. Which of the following results in a decrease in the entropy of the system? (A) O2(g), 300 KO2(g), 400 K (B) H2O(s), 0°C H2O(l), 0°C (C) N2(g), 25°CN2(aq), 25°C (D) NH3(l), -34.5°C NH3(g), -34.5°C (E) 2H2O2(g) 2H2O(g) + O2(g)

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