17. Which of the following is a chiral compound?

(A)①
(B)②
(C)③
(D)④
(E)⑤

18. A compound formed by Ni and Al may form a structure with the unit cell shown on the right. Based on the provided information, which of the following statements is incorrect?(A) This compound is an ionic solid. (B) Each Ni atom is surrounded by 4 Al atoms. (C) Each Al atom is surrounded by 12 Ni atoms. (D) Each unit cell contains 1 Al atom. (E) This compound has a higher melting point than aluminum metal OAl Ni NTHU115

19. Which of the following pairs of compounds have identical normal boiling point?

20. What is the approximate lifting power of 16 g of helium in the atmosphere at 1 atm and 25 °C? (A) 13 g (B) 40 g (C) 80 g (D) 100 g (E) 120 g

21. At room temperature, 0.10 M NaOH solution is added dropwise to 20 mL of 0.10 M CH3COOH solution. The relationship between the negative logarithm of the H+ concentration originating from the autoionization of 5- water, -log[H+]water, and the volume of 10 20 30 40 VNOH(ag/nL NaOH solution added is shown in the graph on the right. Assuming that the volume change upon mixing can be neglected, which of the following statements is correct? (A) At point b, [CH3COO-] ＜ [CH3COOH]. (B) At points c and e, the solutions are both neutral. (C) At point d, the concentration of CH3COO- is greater than that at point e. (D) At point d, [CH3COO-] + [CH3COOH] = 0.05 M. (E) At point f, [Na+] ＞ [CH3COO-]＜[OH-]>[ H+].

22. A 0.10 M solution of the salt BHA has a pH of 6.5 at 25 °C, where B is a weak base and A- is the conjugated base of the weak acid HA. Given that the Kb value for B is 1.0 x 10-6, what is the Ka value for HА? (A) 1.0 x 10-6 (B) 2.0 x 10-6 (C) 1.0 x 10-8 (D) 1.0 x 10-5 (E) 2.0 x 10-5 

23. The nuclide decays by B-emisson with a half-life of 37.2 min. A sample of0.80 mol of H38Cl is placed in a 11.0 L closed container at 300 K, where one of the decay products is H2(g). What is the pressure (atm) in the container after 74.4 min? (R=0.082 atm-L.mol-¹.K-¹) (A) 1.23 (B) 1.79 (C) 2.24 (D) 2.46 (E) 3.13

24. Monosaccharides can be presented in both Haworth and Fischer projection. Which of the following pairs represents the same manosaccharide?

25. The standard molar free energies of formation (△G) of NO2(g) and N2O4(g) at25 °C are 52 and 97 kJ/mol, respectively. Consider the equilibrium at 25 °С:2 NO2(g)⇌ N2O4(g) Which of the following statements is correct? (A) The reaction is endothermic at 25 °C. (B) △S° for this reaction is positive at 25 °C. (C) The equilibrium constant (K) is less than 1 at 25 °C. (D) Decreasing the temperature increases the ratio [N2O4]/[NO2]. (E) The reaction is spontaneous at all temperatures.

26. The rate law for the reaction 2 H2(g) + 2 NO(g) →2 H2O(g) +N2(g) is rate = H2]a[NO]β, and the rates of the reaction under different conditions are as followWhich of the following statements is correct? (A) T2 ＜T1 (B) α = 2, β = 1 (C) When all other conditions are held constant and only the concentrations of the four substances in the reaction system are varied, only the change in the concentration of the reactants has an effect on rate, and the effect of [NO] is greater. (D) At T2, [NO] = 0.1 mol·L-1, the reaction rate is 8r, then [H2] =0.3 mol·L-1 (E) According to the varied reaction rates above, this is an endothermic reaction.

27. Oil painting typically involves a variety of inorganic pigments. Studies have found that under different humidity and light conditions in air, the fading of the pigment orpiment (As2S3) is mainly due to the following two chemical reactions (I and II):(A) The structures of S2O32-and SO42-are both tetrahedral. (B) In both reactions I and II, the elements As and S are oxidized. (C) In reactions I and II, the amount of satisfies: I ＜II.(D) In reactions I and II, the ratio of the number of electrons transferred when 1 mole of As2S3 is oxidized is 3:7. (E) The energy required for reaction I is lower than that for reaction II.

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