66. What hybridization is present in the phosphorus atom in PCl₃ and PCl₅, respectively?
(A) sp ² , d ² sp ³
(B) sp ² , dsp³
(C) dsp, dsp³
(D) sp 3 , d ² sp ³
(E) sp ³ , dsp³

62. Which of the statements below correctly describes the combustion of glucose, shown below? (A) Hydrogen in C6H12O6 is being reduced. (B) Oxygen in O2 is being oxidized. (C) Hydrogen in C6H12O6 is the reducing agent. (D) Oxygen in C6H12O6 is the oxidizing agent. (E) Carbon in C6H12O6 is being oxidized.

63. Reaction intermediates differ from activated complexes in that ________. (A) they are stable molecules with normal bonds and are frequently isolated (B) they are molecules with normal bonds rather than partial bonds and can occasionally be isolated (C) they are intermediate structures which have characteristics of both reactants and products (D) they are unstable and can never be isolated (E) all reactions involve reaction intermediates, but not all have activated complexes

64. Select the Lewis structure for XeO2F2 which correctly minimizes formal charges. (A) (B) (C) (D) (E)

65. Which species has the highest bond order? (A) NO+ (B) O2 (C) O2 − (D) O2 2− (E) NO−

67. The spectrochemical series is I– < Br– < Cl– < F– < OH– < H2O < NH3 < en < NO2– < CN– . Which of the following complexes will absorb visible radiation of the highest energy? (A) [Co(H2O)6] 3+ (B) [CoI6] 3– (C) [Co(OH)6] 3– (D) [Co(en)3] 3+ (E) [CoCl6] 3– 

68. A diprotic acid H2A has Ka1 = 1 x 10–4 and Ka2 = 1 x 10–8 . The corresponding base A2– is titrated with aqueous HCl, both solutions being 0.1 mol/L. Which one of the following diagrams best represents the titration curve which will be seen? (A)(B) (C) (D) (E)

69. Which of the following coordination compounds will form a precipitate (AgCl) when treated with an aqueous solution of AgNO3? (A) [Cr(NH3)3Cl3] (B) [Cr(NH3)Cl]SO4 (C) Na3[Cr(CN)6] (D) [Cr(NH3)6]Cl3 (E) None of the above.

70. If a complex ion is square planar, which d-orbital is highest in energy? (A) dx2-y2 (B) dx2 (C) dxy (D) dyz (E) dxz

71. Which of the following statement is incorrect about hydrocarbons? (A) Breaking the C─H bonds separately of CH4 requires different energies. (B) The average C─H bond energy of CH4 is higher than that of H─H. (C) Hydrocarbons are hydrophobic. (D) Longer alkanes are with higher viscosities than shorter ones. (E) Branched alkanes are with lower boiling points than their corresponding straight isomers.

72. Which of the following molecules is an optically active molecule? (A) (B) (C) (D) (E) None of the above.