15. Which of the following comparisons of the intermolecular dispersion force is incorrect?
(A) C₃H₇OH > C₂H₅OH
(B) CCl₄ > SiCl₄
(C) Br₂ >O₂
(D) Ar> Ne
(E) CH₃CH₂CH₂Cl > (CH₃)₂CHCl

16. Which of the following is a chiral compound? (A) I (B) II  (C) III (D) IV (E) V

17. The osmotic pressure of a 0.010 M aqueous solution of potassium sulfate was measured to be 0.660 atm at 25 ℃. What is the van't Hoff factor (i) for this solution? (gas constant R = 0.082 atm L/mol-K) (A) 0.37 (B) 0.90 (C) 0.98 (D) 2.70 (E) 2.95

18. Which of the following compound names conforms to IUPAC nomenclature? (A) 1-methyl-2-bromobutane (B) 2,2-dibromo-3-chloropropane (C) 2-ethy1-3-chloropentane (D) 3-methy1-3-fluoropentane (E) 1,2-dichloro-3-nitrohexane

19. Which of the following staternents for the unsaturated hydrocarbons is correct? (A) Benzene is more reactive than ethene toward hydrogenation reaction. (B) Combustion of acetylene releases more heat than benzene of the same weight. (C) Ethene is more reactive than benzene toward electrophilic substitution reaction. (D) Both benzene and acetylene have planar molecular geometry. (E) Addition of chlorine can be performed on acetylene, benzene and ethene under mild conditions.

20. The dissolution of a strong electrolyte of type AmBn in water (which can be regarded as a special chemical reaction) is expressed as AmBn = An+(aq) + Bm-(aq), with enthalpy and entropy changes of △H and△S, respectively.Which of the following statements best describesthe dissolution of strong electrolytes of type AmBnof different compositions? (A) Both △H and△S are positive. (B) Both △H and△S are negative. (C) △H ispositive, and △S is negative. (D) △H may be positive or negative, and △S is positive. (E) Both △H and△S may be positive or negative.

21. Lysine H3N+(CH2)4CH(NH2)COO-(denoted by HR) is an essential amino acid, and its hydrochloride salt ([H3R]Cl2) exists in aqueous solution in the following equilibrium: When an NaOH solution is added to a certain concentration of [H3R]Cl2 solution, the distribution cocfficients δ(x) of H3R2+, H2R+,  HR, and R- vary with pH as shown on the right. Given that , which of the following statements is correct?(A)(B) At M, [CI-] + [OH-] +[R-] =2[H2R+] +[Na+] +H+] (C) [H2R+], [HR], and [R-] cannot be in the solution at the same time.  (D) (E) At P,[CI-]>[Na+]>[OH-] >[H+]

22. The use of N2O5 as a nitrifying agent is a new type of green nitrification technology, which has been widely used in industries such as energy-containing materials and pharmaceuticals. For the reaction 2N2O5(g) → 4NO2(g) + O2(g) ， the following reaction sequence was proposed, where it can be approximated that the second step does not affect the equilibrium of the first step. Which of the following statements is correct?(A) the rate of the reverse reaction of the first step<the rate of the reaction of the second step(B) The only intermediate product of the reaction is NO3.(C) The collision of NO2 with NO3 in the second step is only partially effective.(D) The activation energy of the reaction in the third step is higher than the other two.(E) The rate law of this reaction is rate = k[NO2][NO3].

23. You titrated 15 mL of 0.01 M NaCl, NaBr, and NaI solutions with 0.1 M AgNO3 solution, respectively, and used an Ag2S electrode to monitor the change in Ag+ concentration during the titration. The measured Ag2S electrode potential ( E ) versus the volume (V)of AgNO3 solution consumed is shown on the right. It is known that the electromotive force of Ag2S electrode increases with the increase of [Ag+ ], and the produced silver halide by titration exists as a colloid. Which of the following statements is correct? (A) The titration of NaCl solution is curve I. (B) Q is the titration end point. (C) The [Ag+ ] at Q is 0.1 M. (D) From the figure, it can be seen that the silver halide colloid particles mainly adsorb Ag+.(E) This method can be used to determine the concentration of halide ions in solution.

24. The catalyzed reaction of benzene with Br2 is shown in the following figure. Which of the following statements is correct about the sequence of reactions? (A) Reactions of benzene and Br2 are exothermic. (B) From the reaction rate point of view, the catalyzed reaction of benzene with Br2 is mainly a substitution reaction due to the lower activation energy of the reaction. (C) Both bromobenzene and o-dibromobenzene are produced from the catalyzed reaction of benzene and Br2. (D) The rate-determining step in the catalyzed reaction of benzene with Bris accompanied by the breaking and formation of polar bonds. (E) Heating the reaction not only speeds it up, but increases the equilibrium conversion of the substitution reaction.

25. Ca2+, Mg2+, andare removed when purifying crude salt (NaCl) in the laboratory. Which of the following reagents are needed in addition to BaCI2? (A) Na2CO3, NaOH, and HCl (B) Na2CO3, HCI, and KOH (C) K2CO3, HNO3, and NaOH (D) Na2CO3, NaOH, and HNO3 (E) K2CO3, HCI, and KOH

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