49. Which of the following pairs of substances could form an addition copolymer?
(A) HOCH₂CH₂OH + HOOCH₂COOH
(B) HOOC(CH₂)₃COOH + HOCH₂CH₂CHANH₂
(C) HOOCCH₂CH₂COOH + HOCH₂OCH₂ OH
(D) H₂C=CHCH=CH₂ +H₂CCH=CHCH₃
(E) H₂NCH₂ COOH + H₂NCH₂CH₂COOH

45. For which of the following metal ions would there be no distinction between low spin and high spin in octahedral complexes? (A)(B)(C) (D) (E)

46. Which of the following stateme ents is true of the crystal field model? (A) the electrons are assumed to be localized (B) the metal ion-ligand bonds are considered completely ionic (C) the ligands are treated as negative point charges (D) the interaction between metal ion and ligand is treated as a Lewis acid-base interaction (E) none of these statements is true

47. A d6 ion is complexed with six strong-field ligands (for example, SCN-). What is the number of unpaired electrons in this complex? (A) 3(B) 2 (C)0(D) 1(E) 4

48. Which of the following state nts are true about starch? I: the mono omers are fructose and Rlucose； Il: the mon onomer is glucose； Ill: it is the main carbohydrate reservoir in plants； IV: It is the main carbohydrate reservoir in animals； V: It is an addition polymer； VI. It is a condensation polymer. (A) II, III, VI (B) I, IV, V (C) I, II, IV, V (D) I, II, V (E) II, IV, VI

50. Which of the following statements is/are true of benzene? I: Benzene belongs to a class of cyclic unsaturated hydrocarbons known as the aromatic hydrocarbons；II : Benzene undergoes substitution reaction in which hydrogen atoms are replaced by other atoms； Ill: sp2 hybrid orbitals on each carbon of a benzene molecule are used to form the H-H and H-C a bonds. (A) IIl only (B) II only (C) I only (D) I and Il (E) I and Ill

1. 下列哪組是大氣中含量最豐富的氣體？ (A) O2, Ne (B) N2, O2 (C) CO2, O2 (D) He, CO2

2. 真實氣體在何種情況下最接近理想氣體？ (A) 低溫低壓 (B) 高溫低壓 (C) 高溫高壓 (D) 低溫高壓

3. 一個水分子，最多可形成幾個氫鍵？ (A) 0 (B) 2 (C) 4 (D) 無限多個

4. 一個具有七個質子、七個電子及八個中子的元素是下列哪一個? (A) Si (B) N (C) P (D) C

5. 交通號誌的綠色光，其頻率為 ，其波長為何？ (光速 = ) (A) 700 nm (B) 580 nm (C) 530 nm (D) 470 nm