12. Which of the following statements is correct?
(A)Carbon has electron affinity more favorable (exothermic) than nitrogen
(B)H has the radius smaller than He
(C) For Te, S, and Se, the order of increasing atomic size is Se < S < Te
(D) Among Nb, Zn, and Si, Zn has the smallest radius
(E)Among Cl, In, and Se, In has the smallest radius

8. The decomposition of ethanol (C2H5OH) on an alumina (Al2O3) surface, C2H5OH(g) → C2H4(g) + H2O(g), was studied at 600 K. Concentration versus time data were collected for this reaction, and the plot of [A] versus time resulted in a straight line with a slope of -4.00 × mol/L*s. If the initial concentration of ethanol was 1.25 × M, the time required to decompose all ethanol was .(A)5.22 min(B)313 min(C)156 min(D) 31.3 min(E)0.26 min

9. For the reaction PCl5(g) PCl3(g) + Cl2(g) at 327℃, the equilibrium constant, Kp, is 11.5. Suppose that 2.450 g PCl5 is placed in an evacuated 500-mL bulb, which is then heated to 327℃. The partial pressure of PCl3 at equilibrium is atm. (A)0.1(B)2.22(C)1.06 (D) 0.38 (E)4.80

10. Which of the following 0.10 M solutions are correctly arranged in order of the strongest acidic to the weakest acid? (Ka of HNO2 = 4.0 × 10-4; Kb of HONH2 = 1.1 × 10-8) (A)HClO4 > HNO2 > CaBr2 > KNO2 > HONH3ClO4(B)HNO2 > HClO4 > CaBr2 > HONH3ClO4 > KNO2 (C) HONH3ClO4 > HClO4 > HNO2 > CaBr2 > KNO2 (D) HClO4 > HNO2 > HONH3ClO4 > CaBr2 > KNO2 (E)KNO2 > HClO4 > HNO2 > CaBr2 > HONH3ClO4

11. The pH of a 0.05 M solution of trichloroacetic acid (CCl3CO2H), a corrosive acid used to precipitate proteins, has the same pH as a 0.04 M HClO4 solution. The Ka for trichloroacetic acid is thus . (A)4.0 × 10-8(B)1.6 × 10-5(C)0.16 (D) 1.4 × 10-14 (E)0.001

13. In the ground state of mercury, Hg, (A)its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d104p6 5s2 4d10 (B)it has 16 electrons occupying atomic orbitals with n = 3(C)it has 30 electrons in d atomic orbitals (D) it has 10 electrons in px atomic orbitals (E)it has 31 electrons with ‘spin’ up (ms = 1/2)

14. LiI(s) has a heat of formation of -292 kJ/mol and a lattice energy of -753 kJ/mol. The ionization energy of Li(g) is 520 kJ/mol, the bond energy of I2(g) is 151 kJ/mol, and the electron affinity of I(g) is -295 kJ/mol. Use these data to determine the heat of sublimation of Li(s) to be . (A)411 kJ(B)-411 kJ(C)109 kJ (D) -109 kJ (E)161 kJ

15. Which of the following statements is correct? (A)In HF, its bonding molecular orbital has greater H 1s character than fluorine 2p character (B) The bond strength of C2 2- is expected to strengthen as an electron is removed to form the positive charged ion (C) The bond strength of H2 is expected to increase as an electron is removed to form the positive charged ion (D) The order of increasing bond length is CO2+ > CO+ > CO (E)The bond order of CO+ is 3

16. Which of the following statements is correct? (A)HBr has boiling point higher than Kr and Cl2(B)HF has freezing point higher than H2O and NaCl (C) Cl2 has vapor pressure lower than Br2 and I2 (D) CO has freezing point lower than N2 and CO2 (E)HBr has boiling point higher than HF and HCl

17. What is the osmotic pressure of an aqueous solution containing 1.0 g/L of a protein (molar mass = 9.0 × 104 g/mole) and its density of the solution being 1.0 g/cm3 at 25℃? (R = 0.08206 L*atm*mol-1*K-1) (A)0.200 torr(B)0.030 torr(C)0.003 torr (D) 0.400 torr (E)0.0003 torr

18. You have 75.0 mL of 0.10 M HA. After adding 30.0 mL of 0.10 M NaOH, the pH of the HA-NaOH solution is 5.50. What is the Ka value of HA? (A)1.74 × 10-8(B)2.1 × 10-6(C)6.0 × 10-5 (D) 5.6 × 10-4 (E)6.6 × 10-7