(A) 0.20
(B) 1.26
(C) 1.41
(D) 1.64
42. A solution prepared by dissolving 0.100 mole of propionicacid in enough water to make 1.00 L of solution is observed to havea pH = 2.94. What is the Ka for propionic acid?
(A) 1.3 x 10¯6
(B) 1.1 x 10¯3
(C) 1.3 x 10¯5
(D) 1.1 x 10¯2
43. When 0.1M aqueous solutions of the following salts arearranged in order of increasing basicity, what is the correctorder?
SALTS
I. NaCl
II. NH4Cl
III. NaHCO3
(A) I < II < III
(B) I < III < II
(C) II < I < III
(D) III < I < II
47. How many electrons are required to balance the half reactionin which dichromate ion, Cr2O72¯is converted to chromium(III) ions in acid solution?
(A) one
(B) five
(C) six
(D) eight
48. Solutions of Ag+, Cu2+,Fe3+ and Ti4+ are electrolyzed with aconstant current until 0.10 mol of metal is deposited. Which willrequire the greatest length of time?
(A) Ag+
(B) Cu2+
(C) Fe3+
(D) Ti4+
49. What type of radiation is emitted during a nuclear processin which a nucleas with a greater atomic number is formed?
(A) alpha particles
(B) beta particles
(C) positrons
(D) gamma rays
50. Which pair of elements is listed in order of decreasingfirst ionization energy?
(A) Na, Mg
(B) Mg, Al
(C) Al, Si
(D) Si, P
53. An element with a low melting point that does not conductelectricity would most likely be found on the periodic table
(A) in the upper right portion
(B) in the upper left portion
(C) in the lower left portion
(D) in the middle
54. The first three ionization energies of an element X are 590,1145, and 4912 kJ/mol. The most likely formula for a stable ion ofX is
(A) X+
(B) X2+
(C) X3+
(D) X¯
55. The highest oxidation state known for vanadium (Z = 23)is
(A) 2
(B) 3
(C) 4
(D) 5
56. Which have both ionic and covalent bonds?
SALTS
-------------
I. NH4Br
II. NaNO2
(A) I only
(B) II only
(C) both I and II
(D) neither I or II
57. How many valence electrons are present in the tetraborateion (B4O72¯)?
(A) 42
(B) 54
(C) 56
(D) 62
58. Which substance has the highest melting point?
(A) silicon carbide, SiC
(B) phosphorus pentachloride, PCl5
(C) sulfer, S8
(D) phosgene, COCl2
59. All of the following species are pyramidal in shapeexcept
(A) SO32¯
(B) NH3
(C) BF3
(D) H3O+
60. In which compounds in the liquid state does hydrogen bondingoccur?
Compounds
-----------------
I. ammonia
II. hydrogen peroxide
III. methane
(A) I only
(B) I and II only
(C) I and III only
(D) I, II, and III