13. Which of the following methods is applicable to nonvolatile and thermally unstable compounds that contain no
chromophoric functional groups?

(A) capillary electrophoresis
(B) supercritical-fluid chromatography
(C) gas chromatography

(D) thin-layer chromatography
(E) high-performance liquid chromatography

14. The order of the end point sharpness for titration of 50-mL of I- , BrO3 - , Br- and Cl- with AgNO3 in the same concentration is (A) I- ＞ BrO3 - ＞ Br- ＞ Cl- (B) I- ＞ Br- ＞ BrO3 - ＞ Cl- (C) I- ＞ Br- ＞ Cl- ＞ BrO3 - (D) BrO3 - ＞ I- ＞ Br- ＞ Cl- (E) BrO3 - ＞ Cl-> I- > Br－

15. Which one is not correct about standard electrode potential, E0 ? (A) E0 is a relative reduction potential (B) The reactants and products are at unit activity (C) E0 is dependent of the number of moles of reactant and product shown in the balanced half-reaction (D) A positive electrode potential indicates that the half-reaction is spontaneous with respect to the standard hydrogen electrode half-reaction (E) E0 is temperature dependent 

16. Calculate the volume of 0.0500 M EDTA needed to titrate the Ca in 0.2000 g of CaCO3 (100.1 g/mol)(A) 20 mL (B) 25 mL (C) 30 mL (D) 35 mL (E) 40 mL

17. What is the maximum Ksp of AgX needed for quantitative titration of X- with AgNO3 at 0.1 M level sample? (A) 10-7 (B) 10-8 (C) 10-9 (D) 10-10 (E) 10-11

18. Select a suitable acid/base pair to prepare a buffer with a pH of 3.5.(A) NH4Cl/NH3 (Ka = 5.7 × 10-10) (B) Malic acid/Na hydrogen malate (Ka = 3.48 × 10-4)(C) Salicylic acid /Na salicylate (Ka = 1.06 × 10-3) (D) HAc/NaAc (Ka = 1.75 × 10-5)(E) Benzoic acid/ Na benzoate (Ka = 6.28 × 10-5)

19. Select the correct expression.(A) 1 pg = 10-15 g (B) 1 fg = 10-18 g (C) 1 ag = 10-12 g (D) 1 ng = 10-6 mg (E) 1 mg = 10-4 g

20. What is the ionic strength of a 0.1 M Na3PO4 solution?(A) 0.1 M (B) 0.2 M (C) 0.3 M (D) 0.4 M (E) 0.6 M

21. Calculate the Rf values for C on the following TLC plate:(A) 0.35 (B) 0.60 (C) 0.67 (D) 0.8 (E) 0.87

22. Choose the structure consistent with the1H NMR spectrum shown below.(A) (B) (C) (D) (E)

23. Carbon monoxide is toxic because it binds much more strongly to the iron in hemoglobin than O2 does. The equilibrium constant for the binding of CO is about 200 times that for the binding of O2. That is, for the reactionsKCO/KO2 = 2.1 ×102. Calculate the difference in ΔG0for the binding of CO and O2 to hemoglobin at 25℃. (A) –6.5 kJ/mol (B) –13 kJ/mol (C) –19.5 kJ/mol (D) –26 kJ/mol (E) –39 kJ/mol

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