17. A 30.00-mL of a mixture that is 0.1500 M in hydrochloric acid and 0.0500 M in nitrous acid is titrated with 0.1000 M sodium hydroxide. Calculate the pH of the resulting solution after the 8.00 mL of 0.1000 M sodium hydroxide has been added.
(A) 1.01
(B) 2.10
(C) 3.45
(D) 4.39
(E) 8.33

13. Calculate the pH of a 0.05 M NaCN solution. The pKa value for HCN is 9.2 . (A) pH=5.25 (B) pH=3.05 (C) pH=11.83 (D) pH=10.95 (E) pH=8.75

14. A solution is prepared by mixing 100.0 mL of M magnesium nitrate and 200.0 mL of M sodium fluoride. Calculate the concentration of magnesium ion at equilibrium with solid magnesium fluoride  . (A)M (B)M (C)M (D)M (E)M

15. Which of the following sets of molecular structure are incorrect?I. selenium trioxide: T-shaped structureII. silicon tetrafluoride: tetrahedral structureIII. xenon tetrafluoride: tetrahedral structureIV. arsenic pentachloride: trigonal bipyramidal structureV. nitrite ion: V-shaped structure(A) III, V (B) II, III, V (C) I, II, III,V (D) I, III (E) I, IV, V

16. A 1.37 M solution of citric acid (H3C6H5O7) in water has a density of 1.10 g/cm3. Calculate the mole fraction of the citric acid. Citric acid has three acidic protons. (A) 0.056 (B) 0.0035 (C) 0.084 (D) 0.0093 (E) 0.028

18. What volume of 2.0 M sodium hydroxide must be added to 200.0 mL of 1.00 M glycolic acid to produce a buffer solution having a pH of 4.00? (pKa for glycolic acid is 3.83) (A) 67.6 mL (B) 148 mL (C) 59.7 mL (D) 78.6 mL (E) 83.3 mL

19. When 1.00 L of 1.00 M barium nitrate solution at 25.0℃ is mixed with 1.00 L of 1.00 M sodium sulfate solution at 25.0℃ in a calorimeter, the white solid barium sulfate forms, and the temperature of the mixture increases to 32.1℃. Assuming that the calorimeter absorbs only a negligible quantity of heat, the specific heat capacity of the solution is 4.18 J/℃ · g, and the density of the final solution is 1.0 g/mL, calculate the enthalpy change per mole of barium sulfate formed. (A) 59 KJ/mol (B) -59 KJ/mol (C) 30 KJ/mol (D) -30 KJ/mol (E) 89 KJ/mol

20. Which of the following statements are incorrect?I. The hybridization of boron in boron trifluoride is sp2.II. The molecule iodine trifluoride is nonpolar.III. The bond order of disulfur is three.IV. The molecule hydrogen cyanide has two pi bonds and two sigma bonds.V. The magnetism of P2 is paramagnetic.(A) I, II, III, V (B) I, III (C) III,V (D) I, IV (E) II, III, V

1. 兒童 Wilms 氏腫瘤 ( Wilms' tumor ) 最易發生轉移的器官，是下列那一種 ？ (A) 腦部 (B) 肺臟 (C) 肝臟 (D) 骨骼 (E) 皮膚

2. 下列何項 ， 不是影響兒童 Wilms 氏腫瘤 ( Wilms' tumor ) 預後的主要因素 ？ (A) 病理組織類型 (B) 診斷年齡 (C) 腫瘤大小 (D) 左右側別 (E) NWTS 腫瘤分期

3. 小兒畸胎瘤 ( teratoma ) 最好發的部位，是在 ？ (A) 睪丸 ( testicular ) (B) 縱膈部 ( mediastinal region ) (C) 卵巢 ( ovarian ) (D) 薦尾椎部 ( sacrococcygeal region ) (E) 腦部