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

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)

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

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

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