63. The correct order of the bond angles in H₂S, NH₃, BF₃ and SiH₄ is
(A) H₂S ＜NH₃ ＜SiH₄ ＜BF₃
(B) NH₃＜H₂S ＜SiH₄ ＜BF₃
(C) H₂S ＜ SiH₄ ＜NH₃ ＜BF₃
(D) H₂S ＜NH₃＜BE₃ ＜SiH₄
(E) BF₃ ＜SiH₄ ＜NH₃ ＜H₂S

64. Which diene and dienophile would you choose to synthesize the following compounds? (A) (B) (C)(D)(E)

65. trans-3-Methylcyclopentanol is treated with CH3SO2Cl in the presence of base. The product of this reaction is then heated with 1 equivalent of KI in methanol. What is the final product? (A) cis-1-Iodo-3-methylcyclopentane (B) trans-1-lodo-3-methylcyclopentane (C) 1-Methylcyclopentene (D) 2-Methylcyclopentene (E) 3-Methylcyclopentene

66.Given four oxygen species: O2+, O2, O2- , O22- . Which of the following is the correct order of their0-0 bond length? (A)O2+＞O2>O2- >O22-  (B)O22-  ＞O2-＞O2＞O2+ (C)O22- ＞O2-＞O2+＞O2(D)O2->O2+>O22- >O2 (E)O2＞O2+＞O2->O22-

67. Which of the following monomers or pairs of monomers is used to make the addition polymer neoprene shown on the right? (A)(B)(C) (D)(E)

68. For the titration reaction A+B→C, where A=analyte, B-titrant, and C-product, the end point is to be detected spectrophotometrically at 550 nm, based on the absorbance information shown on the right. The shape of the titration curve at 550 nm would most closely resemble which of the following?(A)(B)(C)(D)(E)

69. At sufficiently low temperatures, gaseous ammonia has a molar volume that is less than that predicted by the ideal gas law at certain low pressures, but has a molar volume that is greater than that predicted at certain high pressures. Which of the following is a reasonable explanation for this behavior? (A) Attractive forces predominate at these low pressures, and repulsive forces predominate at these high pressures. (B) Repulsive forces predominate at these low pressures, and attractive forces predominate at these high pressures. (C) Repulsive forces operate over greater distances than attractive forces. (D) As the pressure of a gas increases, its temperature increases. (E) Hydrogen bonding is not a factor at the critical pressure.

70. Analysis of a bottle of 100 mg vitamin C tablets yields an average vitamin C content of 99.8 mg, with a standard deviation of ±0.3 mg. Assuming Gaussian statistics, which of the following is true? (A) None of the tablets contains less than 99.5 mg of vitamin C. (B) 68% of the tablets contain between 99.5 and 100.1 mg of vitamin C. (C) 97% of the tablets contain between 99.5 and 100. 1 mg of vitamin C. (D) All of the tablets contain less than 100 mg of vitamin C. (E) The average value is incorrect.

71. In emission spectroscopy, which of the following relaxation processes occurs at around 10-12 s? (A) Fluorescence resonance energy transfer (B) Internal crossing (C) Fluorescence emission (D) Phosphorescence emission (E) Vibration relaxation

72. Chelation therapy is known as the administration of chelating agents to eliminate toxic heavy metals from the body and has been practiced for many years in clinical toxicology. EDTA is used for intravenous injection as a detoxification treatment for heavy metal ions. Which of the following statement associated with EDTA is incorrect? (A) EDTA is a hexadentate ligand. (B) The full name of EDTA is ethylenediaminetetraacetate. (C) A direct titration method is suitable for analytes that are precipitated in the absence of EDTA. (D) EDTA is commonly used as an additive for collecting whole blood and plasma specimens. (E)After complexation with Fe3+, the EDTA can be detected by UV-vis absorption spectroscopy.

73. Which of the following methods could be used to determine the molecular weight of bovine serum albumin? (A) Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (B) Size-exclusion chromatography (C) Sodium dodecyI sulfate-polyacrylamide gel electrophoresis (D) Electrospray ionization mass spectrometry (E) All of above

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