33. Which of the following elements has the greatest electron affinity (largest positive value)?
(A) Mg
(B) Al
(C) Si
(D) P

34. Consider the following reaction 2A + 3F2 → 2AF3. What is the formula for the reaction product if we substitute iodine for fluorine? (A) A2I3 (B) A3I2 (C) AI3 (D) A3I

35. Give the number of lone pairs around the central atom and the molecular geometry of XeF4. (A) 0 lone pairs, tetrahedral (B) 1 lone pair, distorted tetrahedron (seesaw) (C) 1 lone pair, square pyramidal (D) 2 lone pairs, square planar

36. According to the VSEPR theory, the geometry of the SO3 molecule is (A)pyramidal (B)tetrahedral (C)trigonal planar (D)distorted tetrahedron (seesaw)

37. According to VSEPR theory, which one of the following species has a tetrahedral geometry? (A) IF4+ (B) IF4– (C) PCl4+ (D) PCl4–

38. The bond angle in Cl2O is expected to be approximately (A) 90°. (B) 109.5° (C) 120° (D) 145°

39. Indicate the type of hybrid orbitals used by the central atom in BrF3. (A) sp (B) sp2 (C) sp3 (D) sp3d

40. The number of pi bonds in the oxalate ion (C2O42–) is (A) 1 (B) 2 (C) 3 (D) 4

41. Which of the following molecular changes is necessary for mass spectrometry to occur? (A) excitation of an electron from the ground state to higher energy state (B) change of alignment of an electron in a magnetic field (C) change of alignment of a proton in a magnetic field (D) loss of an electron

42. Which of the following m/z values is the molecular ion for 2-butanone? (A) 29 (B) 43 (C) 57 (D) 72

43. Which of the following statements best explains the information we can gain from mass spectrometry? (A) It allows us to determine the number of protons in a compound. (B) It allows us to determine the kinds of functional groups in a compound. (C) It allows us to determine the molecular weight and the mass of some fragments of a compound. (D) It allows us to determine the presence and nature of a carbocation in the compound.

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