5. The conjugate base of formic acid, HCOOH, is. A) OH B) CH 3 COO C) HCOO D) CO 2
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1 1. A Br๘nsted acid is a(n). A) proton donor B) hydroxide ion donor C) proton acceptor D) electron donor 2. A Br๘nsted base. A) is a cation B) does not possess a lone pair of electrons C) possesses a lone pair of electrons D) is always an Arrhenius base 3. Which of the following can act both as a Br๘nsted acid and base? A) NH 3 B) H 2 O C) CO 3 2 D) OH 4. An example of a Br๘nsted base is. A) BF 3 B) NH 4 + C) HCN D) NH 3 5. The conjugate base of formic acid, HCOOH, is. A) OH B) CH 3 COO C) HCOO D) CO In the reaction A) HPO 4 2 is a conjugate acid B) HPO 4 2 is a conjugate base C) NH 3 is an acid D) NH 4 + is a conjugate base,. Page 1
2 7. The conjugate acid of HSO 4ฏ is. A) H 2 SO 4 B) SO 4 2 C) SO 3 2 D) HSO 3 8. Which one of the following will act only as a Br๘nsted base? A) H 2 C 2 O 4 B) HC 2 O 4 C) C 2 O 4 2 D) H 3 O + 9. The conjugate base of HIO 4 is. A) HIO 3 B) IO 4 + C) IO 4 D) H 2 IO Which of the following is correct relating [H + ] and [OH ] in solution at 25 C? A) [H + ] + [OH ] = B) [H + ] + [OH ] = 14.0 C) [H + ] [OH ] = D) [H + ] [OH ] = ph is A) log [H + ] B) log 1/[H + ] C) -log [H + ] D) 1/log[H + ] 12. The ph of a solution cannot be. A) 0 B) 1 C) 10 D) Page 2
3 13. The equation relating ph and poh is. A) ph poh = 14 B) ph poh = C) ph + poh = 14 D) ph + poh = The concentration of OH ions in a M HCl solution is. A) M B) M C) M D) M 15. The ph of a 0.62 M KOH solution is. A) 0.21 B) C) 1.21 D) The ph of M Ba(OH) 2 will be. A) B) 3.55 C) 9.86 D) The hydrogen ion concentration of a solution having a ph of 2.42 is. A) M B) M C) M D) M 18. The hydrogen concentration of a solution having a ph 16 is. A) M B) M C) 0 D) M Page 3
4 19. Which of the following is true for a solution having ph < 7? A) [H + ] < 10 7 M B) [OH ] > 10 7 M C) It is a basic solution. D) [H + ] > 10 7 M 20. Which of the following statements is true? A) poh > 7; The solution is basic. B) ph > 7; The solution is acidic. C) ph< 7; The solution is acidic. D) poh < 7; The solution is acidic. 21. The poh of a solution is Its hydrogen ion concentration is. A) M B) M C) M D) M 22. The number of moles of KOH in 5.50 ml of a M KOH solution is. A) B) C) D) The poh of M KOH solution is. A) B) C) D) How much NaOH is needed to prepare 546 ml solution with a ph=10.00? A) 2.2 g B) g C) g D) g Page 4
5 25. An example of a strong acid is. A) CH 3 COOH B) HCN C) H 2 CO 3 D) HClO Which one of the following statements is true? A) The conjugate base of a strong acid is strong. B) The conjugate base of a strong acid is weak. C) The conjugate acid of a weak base is weak. D) H 2 SO 4 is a strong acid. Therefore, HSO 4 is a strong conjugate base. 27. The weakest conjugate base below is. A) CH 3 COO B) CN C) HSO 4 D) HCO The weakest acid below is. A) HCl B) HClO 4 C) HF D) HNO The strongest base below is. A) NH 2 B) Cl C) HSO 4 D) NH Which one of the following statements is true for a 1.0 M solution of a weak acid HA? A) ph = 0 B) [H + ] >> [A ] C) [H + ] = [A ] D) ph < 1 Page 5
6 31. Which of the following statements is true for a 1.0 M solution of a strong acid HA? A) [A ] > [H + ] B) [HA] = 1.0 M C) ph = 1 D) ph = Which of the following statements is true with respect to the reaction below? A) The reaction favors the formation of F (aq). B) F is a stronger base than OH. C) Hydrofluoric acid is a weaker acid than water. D) The reaction favors the formation of HF (aq). 33. Which of the following statements is true with respect to the reaction below? A) The reaction favours the formation of CH 3 COO. B) CH 3 COO is a weaker base than Cl. C) Cl is a weaker base than CH 3 COO. D) The reaction favours the formation of HCl. 34. Which of the following statements is correct with respect to an acid? A) Stronger acids have smaller K a values. B) Weaker acids have smaller K a values. C) The strength of an acid is inversely proportional to its K a value. D) Weaker acids have greater H + concentration. 35. Normally K a values are quoted for an acid such as. A) HCl B) HNO 3 C) H 2 SO 4 D) HCN 36. Which of the following 0.40 M solutions has the highest ph? A) HCOOH B) HCl C) HNO 3 D) CH 3 COOH Page 6
7 37. The ph of a 0.1 M benzoic acid solution (K a = ) is. A) 3.6 B) 2.6 C) 2.0 D) g of CH 3 COOH (K a = ) is dissolved in enough water to obtain 50.0 ml of solution. The concentration of H + in the solution is. A) M B) M C) M D) M 39. What is the concentration of CH 3 COOH (K a = ) in 50.0 ml of a M CH 3 COOH solution? A) M B) M C) M D) M 40. The ph of a M weak monoprotic acid is The K a of the acid is. A) B) C) D) A formic acid (K a = ) solution has a ph of What is the original molarity of the HCOOH solution? A) M B) M C) M D) M 42. The percent ionization of 0.20 M benzoic acid (K a = ) is. A) 18 B) 1.8 C) 4.3 D) 43 Page 7
8 43. The percent ionization of HF (K a = ) is greatest for which of the following HF solutions? A) M B) 0.46 M C) M D) 1.6 M 44. A M monoprotic acid solution is 14% ionized. Its K a value is. A) B) C) D) The percent ionization of a 0.20 M acetylsalicylic acid solution (K a = ) is. (Acetylsalicylic acid is monoprotic) A) 39% B) 0.39% C) 3.9% D) 4.9% 46. The percent ionization of a 0.20 M acetylsalicylic acid solution in the stomach where the ph is 1.00 is. A) 3.0% B) 0.30% C) 30% D) 0.03% 47. Which of the following 0.2 M solutions has the highest ph? A) NH 3 B) C 6 H 5 OH C) NaOH D) C 5 H 5 N 48. The ph of a 0.1 M aqueous NH 3 solution (K b = ) will be. A) 2.89 B) C) 3.89 D) Page 8
9 49. The ph of a 0.30 M solution of a weak base is What is the K b of the base? A) B) C) D) What is the original molarity of an ammonia solution whose ph = 11.22? A) 1.5 M B) 0.15 M C) M D) M 51. The percent of NH 3 present as NH 4 + in M NH 3 solution is. A) 15% B) 2.5% C) 25% D) 1.5% 52. What is the relationship between the K a for a weak acid and the K b for its conjugate base? A) K a + K b = K w B) K a K b = K w C) K a /K b = K w D) K b /K a = K w 53. The value of K b for NH 3 is The value of K a of NH 4 + is. A) B) C) D) An example of a diprotic acid is. A) benzoic acid B) carbonic acid C) formic acid D) hydrofluoric acid Page 9
10 55. Which of the following will act only as Br๘nsted base? A) H 3 PO 4 B) PO 4 3 C) H 2 PO 4 D) HPO The first and second ionization constants of a certain diprotic acid H 2 A are K a1 and K a2 at a certain temperature. Under what conditions will [A 2 ] =K a2? A) K a1 = K a2 B) K a1 << K a2 C) K a1 >> K a2 D) K a1 + K a2 = K w 57. Which one of the following will have the lowest ph? A) 0.04 M H 2 SO 4 B) 0.04 M CH 3 COOH C) 0.04 M HCl D) 0.04 M NH Which of the following will be present in the smallest concentration in an aqueous M H 2 CO 3 solution? A) H 2 CO 3 B) CO 3 2 C) HCO 3 D) H 3 O The strength of an acid depends on. A) properties of the solvent B) temperature C) molecular structure of the acid D) all of the above 60. The strength of an oxoacid depends on the of the central atom. A) electronegativity B) oxidation state C) electronegativity and oxidation state D) electron affinity. Page 10
11 61. The strongest binary acid below is. A) H 2 S B) H 2 Se C) H 2 O D) CH The correct order of the strength of the acids below is. A) H 2 SeO 4 > H 2 SO 4 B) H 2 SO 4 > H 2 SeO 4 C) H 3 PO 4 < H 3 AsO 4 D) HClO > HClO The strongest acid below is. A) CH 3 COOH B) CH 2 Cl COOH C) CH 2 F COOH D) CH 3 CH 2 COOH 64. The correct order of acid strength is. A) C 6 H 5 OH < CH 3 OH B) HCOOH < CH 3 COOH C) C 6 H 5 OH > CH 3 OH D) CH 3 OH > CH 3 COOH 65. The ph of a 1.0 M aqueous solution of NaNO 3 will be. A) 1.0 B) 0 C) 7.0 D) The ion below most likely to undergo hydrolysis is. A) Na + B) SO 4 2 C) Cl D) Al 3+ Page 11
12 67. Which of the following is a Br๘nsted acid? A) [Al(H 2 O) 6 ] 3+ B) Al 3+ C) Ca(OH) 2 D) PO Which salt will not undergo hydrolysis? A) KF B) Na 2 CO 3 C) K 2 SO 4 D) NaI 69. Which salt will not undergo hydrolysis? A) CH 3 COONa B) NH 4 NO 2 C) FeCl 3 D) NaNO The ph of an aqueous solution of KBr will be. A) > 7 B) < 7 C) 0 D) Which of the following salt solutions will have ph > 7? A) Bi(NO 3 ) 3 B) KBr C) CH 3 COO Na D) BaCl The alkaline earth metal ion most likely to undergo hydrolysis is. A) Ba 2+ B) Be 2+ C) Ca 2+ D) Sr 2+. Page 12
13 73. Which metal ion will not undergo hydrolysis? A) Al 3+ B) Bi 3+ C) Be 2+ D) Cs The ph values of 0.10 M solutions of the four salts KW, KX, KY and KZ were found to be 7, 11, 8, 10, respectively. The weakest acid is. A) HW B) HY C) HX D) HZ 75. The ph of a 0.36 M CH 3 COONa solution will be. A) 8.15 B) 7.00 C) D) The ph of a 0.42 M NH 4 Cl solution will be. A) 4.82 B) 7.0 C) 9.82 D) An aqueous solution of NaHCO 3 will have a ph. A) < 7 B) 7 C) 0 D) > An aqueous solution of K 2 HPO 4 will be. A) basic B) acidic C) neutral D) amphoteric Page 13
14 79. An example of a neutral oxide is. A) K 2 O B) CO 2 C) SO 3 D) CO 80. Al 2 O 3 is a(n) oxide. A) acidic B) amphoteric C) neutral D) basic 81. Which of the following statements is correct? A) A metal oxide will be basic if the oxidation number of the metal is high. B) A metal oxide will be acidic if the oxidation number of the metal is high. C) A metal oxide will be acidic if its oxidation number is low. D) A neutral oxide is always a metallic oxide. 82. An example of an acidic oxide is. A) CaO B) Al 2 O 3 C) N 2 O 5 D) CaO 83. Which of the following oxides is most acidic? A) Cr 2 O 3 B) CrO C) CrO 3 D) Na 2 O 84. The increasing order of basicity of the oxide is. A) Al 2 O 3 < BaO < K 2 O B) Al 2 O 3 > BaO > K 2 O C) CrO 3 > Cr 2 O 3 > CrO D) K 2 O < BaO < Al 2 O 3 Page 14
15 85. Zn(OH) 2 is a(n) hydroxide. A) basic B) acidic C) neutral D) amphoteric. 86. Zn(OH) 2 will react with. A) HCl B) KOH C) HNO 3 D) all of the above 87. Zinc hydroxide reacts with NaOH to yield. A) ZnO B) [Zn(OH) 4 ] 2 C) Zn(OH) 4 D) ZnO Al(OH) 3 dissolves in excess NaOH to yield. A) Al 2 O 3 B) Al(OH) 2 C) Al(OH) 4 D) AlH According to Lewis: A) An acid is an electron pair donor. B) An acid is electron pair acceptor. C) A base is electron pair acceptor. D) AlCl 3 is a base. 90. A Lewis acid is. A) electron rich B) an anion C) electron deficient D) an electron donor Page 15
16 91. An example of a Lewis acid is. A) NH 3 B) OH C) BCl 3 D) I 92. Which of the following is a Lewis base? A) CO 2 B) H 2 O C) SO 2 D) AlCl In the reaction: A) Cl acts as a Lewis acid. B) AlCl 3 acts as a Lewis base. C) Cl acts as a Lewis base. D) AlCl 4 acts as a Lewis acid. 94. The correct order of Lewis acid strength is. A) BCl 3 > BF 3 B) Fe 3+ < Fe 2+ C) Ag > Ag + D) BF 3 > BCl An example of a Lewis acid that is not Br๘nsted acid is. A) SO 2 B) CH 3 COOH C) HIO 4 D) HNO Which of the following statements is correct with respect to formic acid? A) It is a weaker acid than acetic acid. B) It is a weaker acid at high temperature. C) It is a stronger acid at high temperature. D) It is a diprotic acid. Page 16
17 97. What volume of CO 2 gas is generated at 1atm and 37ฐC from the reaction of 0.350g of NaHCO 3 with excess gastric juice(hcl) according to : A) 1.06 L B) L C) 10.6 L D) 106 L 98. To which of the following would the addition of an equal volume of 0.60 M NaOH lead to a solution with a lower ph? A) water B) 0.30 M HCl C) 0.70 M KOH D) 0.40 M NaNO HA and HB are both weak acids although HB is stronger than HA ml of 0.10 M NaOH is required to neutralize 50 ml of 0.10 M HB. The volume of 0.10 M NaOH required to neutralize 50.0 ml of 0.10 M HA is. A) 50. ml B) 55 ml C) 45 ml D) 100 ml 100. A solution contains the weak monoprotic acid HA and its sodium salt NaA, both at 0.10 M concentration. The concentration of OH will be. A) K a /K w B) K a K w C) K a +K w D) K w /K a 101. The equilibrium constant for the reaction = ) A) B) C) D) is. (HCOOH : K a Page 17
18 102. The acid ionization constant for CH 3 COOH and HNO 2 are and , respectively. The equilibrium constant for the reaction A) B) C) D) is The hydride ion, H reacts with water to yield. A) O 2 B) H 2 O 2 C) H 2 D) H 2 and O The ph of a 0.20 M CH 3 COONH 4 solution will be. A) 3.00 B) C) 0 D) Novocaine is a weak base with K b = What is the ratio of novocaine to that of its conjugate acid at ph = 7.40? A) 2.8 B) C) 0.28 D) The strongest base below is. A) NF 3 B) NCl 3 C) BCl 3 D) NH The strongest base below is. A) PH 3 B) NH 3 C) PCl 3 D) BH 3 Page 18
19 108. The ion product of D 2 O is at 25ฐC. For a solution to be acidic pd must be. A) < 7.43 B) > 7.43 C) < 7.0 D) The relation between pd and pod for D 2 O (K = ) is. A) pd + pod = 14 B) pd + pod = C) pd + pod = D) pd + pod = Which of the following is a weak acid? A) HNO 3 B) HClO 4 C) HNO 2 D) HIO The weakest acid below is. A) HI B) HNO 3 C) H 2 SO 4 D) HF 112. What is the ph of ml of an aqueous solution containing 0.616g of the strong acid trifluoromethane sulfonic(cf 3 SO 3 H) acid? A) 4.79 B) 3.79 C) 2.79 D) The hydronium ion is. A) H + B) H 3 O + C) H D) OH Page 19
20 114. The ph of a M aqueous HCl solution will be. A) 7.2 B) 7.0 C) 6.8 D) Hemoglobin( Hb) also exists in the protonated form as HbH +. The binding of oxygen can be represented as. What form of hemoglobin is favoured in the lungs where the concentration of oxygen is highest? A) Hb B) HbO 2 C) HbH + D) HbO 116. The concentration of H 2 PO 4 in a M H 3 PO 4 solution is. (K a1 = , K a2 = , K a3 = ) A) M B) M C) M D) M 117. The concentration of HCO 3 in an aqueous solution of 0.10 M Na 2 CO 3 is. The ionization constants for H 2 CO 3 are K a1 = , K a2 = A) M B) M C) M D) M 118. The Henry's law constant for CO 2 at 38ฐC is mol. L 1 atm 1. What is the ph of a solution of CO 2 at 38ฐC in equilibrium with CO 2 gas at a partial pressure of 3.20 atm? The ionization constants for H 2 CO 3 are K a1 = and K a2 = A) 5.26 B) 6.26 C) 4.26 D) 3.26 Page 20
21 119. How many grams of NaCN are needed to make ml of a solution with a ph of 10.00? A) g B) g C) g D) 7.4 g 120. A solution of formic acid has a ph of How many grams of formic acid are there in ml of the solution? A) 2.4g B) 0.24g C) 0.024g D) g 121. What is the ph of a 1liter solution containing mole of CH 3 COOH and mole of HCl? A) 0.60 B) 1.30 C) 2.30 D) g of Mg reacts with 80.0 ml of a HCl solution whose ph = The ph of the solution at the end of the reaction is. A) 0.20 B) 0.20 C) D) Which of the following statements is correct with respect to a weak acid HB and a strong acid HA of the same concentration? A) ph of HA > ph of HB B) ph of HA < ph of HB C) HB will have greater conductance than HA. D) [H + ] in HB > [H + ] in HA 124. Which of the following statements is correct with respect to the hydrolysis of NaNO 2? A) Addition of HCl enhances hydrolysis. B) Addition of HCl decreases hydrolysis. C) Addition of NaOH enhances hydrolysis. D) Addition of NaCl enhances hydrolysis. Page 21
22 125. Which of the following is a Lewis acid-base reaction? A) oxidation of Fe 2+ to Fe 3+ B) hydration of SO 2 C) ionization of NaCl D) reduction of CH 2 O 126. Which of the following statements is true with respect to amines? A) They are acids like formic acid. B) They are bases like ammonia. C) They react with ammonia to form salts. D) They are Br๘nsted acids A solution of methylamine (CH 3 NH 2 ) has a ph of How many grams of methylamine are present in mlof the solution? (K b = ) A) g B) 0.26 C) g D) 2.6 g 128. A 0.400M aqueous solution of a weak monoprotic acid freezes at 0.758ฐC. What is the K a for the acid? (Assume that the molarity of the solution is equal to the molality.) A) B) C) D) Which among the following statements is correct with respect to NH 2 and N 3? A) NH 2 reacts with water to yield NH 3 and O 2. B) N 3 reacts with water to yield NH 3 and OH. C) N 3 reacts with water to yield NH 4 + and OH. D) NH 2 reacts with water to yield NH 4 + and H 2 O Atmospheric air in some region contains 0.12 ppm of SO 2 by volume. The ph of rainwater due to this pollutant is. Assume that the dissolution of SO 2 does not affect its pressure. (K a1 for H 2 SO 3 is ) A) 3.40 B) 5.40 C) 2.40 D) 4.40 Page 22
23 131. The ionization constant of HClO is The percent of ClO present at a ph of 7.80 is. A) 66% B) 26% C) 36% D) 46% Page 23
24 Answer Key 1. A 2. C 3. B 4. D 5. C 6. B 7. A 8. C 9. C 10. D 11. C 12. D 13. C 14. A 15. B 16. D 17. A 18. B 19. D 20. C 21. B 22. C 23. A 24. C 25. D 26. B 27. C 28. C 29. A 30. C 31. D 32. A 33. C 34. B 35. D 36. D 37. B 38. D 39. B 40. A 41. D 42. B 43. C 44. A Page 24
25 45. C 46. B 47. C 48. B 49. D 50. B 51. D 52. B 53. A 54. B 55. B 56. C 57. A 58. B 59. D 60. C 61. B 62. B 63. C 64. C 65. C 66. D 67. A 68. D 69. D 70. D 71. C 72. B 73. D 74. C 75. D 76. A 77. D 78. A 79. D 80. B 81. B 82. C 83. C 84. A 85. D 86. D 87. B 88. C 89. B 90. C Page 25
26 91. C 92. B 93. C 94. D 95. A 96. C 97. B 98. C 99. A 100. D 101. C 102. B 103. C 104. D 105. B 106. D 107. B 108. A 109. B 110. C 111. D 112. D 113. B 114. C 115. B 116. A 117. A 118. C 119. B 120. B 121. D 122. A 123. B 124. A 125. B 126. B 127. C 128. B 129. B 130. D 131. A Page 26
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