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

38. Which is the most reactive form of phosphorus? (A) white phosphorus (B) red phosphorus (C) black phosphorus (D) two of these forms of phosphorus are equally reactive (E) all of these forms of phosphorus are equally reactive

39. When a non volatile solute is added to a volatile solvent, the solution vapor pressure________ ， the  boiling point ________ , the  freezing point________，and the osmotic pressure across a  semipermeable membrane_________. (A) decreases, decreases, increases, decreases (B)J increases, decreases, increases, decreases (C) decreases, increases, decreases, increases (D) increases, increases, decreases, increases (E) decreases, increases, decreases, decreases

40. Which of the following statements is(are) true? (A) the rate of dissolution of a solid in a liquid always increases with incr reasing temperature (B) the solubility of a solid in a liquid always increases with increasing temperature (C) according to Henry's law, the amount of gas dissolved in a solution is directly proportional to the pressure of the gas above the liquid (D) two of these statements are true (E) all of these statements are true.

41. Which statement regarding water is true? (A) liquid water is less dense than solid water.(B) only covalent bonds are broken when ice melts (C) hydrogen bonds are stronger than covalent bonds (D) energy must be given off in order to break down the crystal lattice of ice to a liquid (E) all of these statements are false.

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

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