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

42. Which of the following is the smallest hole in a closest-packed lattice of spheres? (A) trigonal (B) cubic (C) tetrahedral (D) octahedral (E) none of these

43. The unit cell in a certain lattice consists of a cube formed by an anion at each corner, an anion in the center, and a cation at the center of each face. The unit cell contains a net (A) 2 anions and 3 cations (B) 2 anions and 2 cations (C) 5 anions and 3 cations (D) 3 anions and 4 cations (E) 5 anions and 6 cations.

44.How many of the following compounds exhibit geometric isomers? I: Pd(NHa3)2Br2 (square planar)； Il:[Co(H2O)2]Br3； I1:[Ni(H2O)4(NO2)2]； lV:K2[CoCl4] (A) 2(B) 3 (C) 1 (D) 4(E)0

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)

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

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

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