17. Which of the following compounds (1-5) is optically active?

(A)1
(B) 2
(C) 3
(D) 4
(E) 5

18. Which of the following compounds (6-10) is chiral?  (A)6 (B)7 (C) 8 (D) 9 (E) 10

19. Which of the following compounds (11-15) is not monosaccharide? (A)11 (B) 12 (C) 13 (D) 14 (E) 15

20. Each of the longest wavelength of the spectral lines recorded for two electron transitions from n = 2 and n = 4 of hydrogen atoms is X and Y, respectively. What is the relationship between X and Y? (A) X:Y = 11:34 (B) X:Y = 5:4 (C) X:Y= 1:4 (D) X:Y = 5:144 (E) X:Y=7:108

21. As shown in Fig, 1, a container with a frictionless movable partitions fixed volume at constant temperature is divided into three compartments (A, B, Hz and C) by two partitions, which are movable without friction. Compartments A and C are filled with an equal amount of mass of gas X and Y. When two partitions stop sliding, the density of X is equal to that of Y. Which of the following statements is correct?  (A) Volume of gas: V(X) ＞ V(H2) ＞ V(Y) (B) Number of moles of gas: n(X) ＜n(H2) ＜n(Y) (C) Number of moles of gas: n(X) = n(H2) = n(Y) (D) The molecular mass of X is equal to the molecular mass of Y. (E) The molecular mass of X is smaller than the molecular mass of Y.

22. Which of the following groups of species can coexist in significant amounts in a given solution at room temperature? (A) A solution that turns methyI orange red contains . (B) A solution that turns phenolphthalein red contains , and. (C) 0.1 M AgNO3 solution contains , and I-. (D) 0.1 M Na[Al(OH)4] solution contains H+, Na+, CI-, and. (E) An acidic potassium permanganate solution contains , and glucose.

23. Under the same conditions, Na, Mg, and Al of equal molar amounts are respectively added to three test tubes X, Y, and Z containing the same concentration and volume of dilute hydrochloric acid to fully react at room temperature. Which of the following three test tubes X, Y and Z must be incorrect in relation to the volume of gas produced? (A) X(Na) ＞ Y(Mg)＞ Z(Al) (B) X(Na) ＞ Y(Mg) = Z(Al) (C) X(Na) ＜Y(Mg)＜Z(Al) (D) X(Na) =Y(Mg)=Z(Al) (E) X(Na) ＜Y(Mg) = Z(Al)

24. A certain amount of Cl2is introduced into a n/mole certain concentration of potassium hydroxide 0.06 solution, where both reagents are completely consumed and heat is released. Three ionic species0.03 containing chlorine arc produced from this reaction, among which the amount (n/mole) of ClO- and ions and the reaction time (t/s) are shown in Which of the following statements is incorrect? (A) Different reactions of Cl2 and potassium hydroxide solutions may occur at different temperatures. (B) The number of electrons transferred in the reaction is (C) The amount of KOH in the original potassium hydroxide solution cannot be determined. (D) The amount of Cl- in the product is 0.21 mol. (E) The amount of K+in the solution is 0.30 mol. 

25. Based on the following experiments, which substance can prove to be bleaching? (A) When chlorine is introduced into a NaOH solution with phenolphthalein, the solution immediately discolors. (B) When a small amount of Na2O2 powder is added to the water with phenolphthalein, the solution first turns red and then discolors. (C) The red color of phenolphthalein solution fades after the addition of SO2. (D) When SO2 is added to an acidic solution of KMnO4, the purple color of the solution fades. (E) Addition of nitric acidified AgNO3 solution to chlorine water results in white precipitate.

26. Two bottles of gas are NO2(g) and Br2(g) with the same appearance. A chemist designed a variety of identification methods:  I. wet test paper with starch/KI,  II. addition of a small amount of NaCl solution, III. addition of a small amount of AgNO3solution, IV. addition of a small amount of water and then an appropriate amount of benzene,  V. change the temperature  Which methods can be used to distinguish NO2(g) from Br2(g)? (A) I, III, IV (B) II, III, IV (C) I, II, III, IV (D) I, II, III,V (E) II, III, IV, V

27. At 298 K and 101 kPa, 2 . At the same temperature and pressure, 2 moles of SO2 and 1 mole of O2 are introduced into a closed container, and when equilibrium is reached, the amount of heat given off is Q1. If I mole of SO2, 0.5 mole of O2 and 1 mole of SO3 are introduced into a container of the same volume, and the amount of heat given off at equilibrium is Q2, which of the following relationships is correct? (A) Q2 ＜Q1＜197kJ (B) Q2＞Q1＞ 197 kJ (C) Q2= Q1= 197 kJ (D) Q1＜Q2＜197 kJ (E) Q2= Q1 ＜197 kJ

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