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AP ECET CHEMISTRY Multiple Choice Questions (MCQs)

AP ECET Chemistry - Acids and Bases Questions

AP ECET Chemistry - Acids and Bases

46. Which theory defines acids as substances that produce H⁺ ions in aqueous solutions?

a) Bronsted-Lowry theory

b) Lewis theory

c) Arrhenius theory

d) None of the above

Answer: c) Arrhenius theory

47. According to the Bronsted-Lowry theory, acids are substances that:

a) Accept protons

b) Donates protons

c) Dissociate in water

d) Contain hydrogen ions

Answer: b) Donates protons

48. Which theory defines acids as electron-pair acceptors and bases as electron-pair donors?

a) Bronsted-Lowry theory

b) Lewis theory

c) Arrhenius theory

d) Solvent system theory

Answer: b) Lewis theory

49. What is the ionic product of water at 25°C?

a) 1 × 10⁻¹⁴

b) 1 × 10⁻⁷

c) 1 × 10⁻¹⁰

d) 1 × 10⁻⁹

Answer: a) 1 × 10⁻¹⁴

50. What does a low pH indicate about a solution?

a) It is neutral

b) It is acidic

c) It is basic

d) It contains an equal number of H⁺ and OH⁻ ions

Answer: b) It is acidic

51. Which of the following is a property of a buffer solution?

a) It resists changes in pH when small amounts of acid or base are added

b) It has a fixed pH

c) It changes color in the presence of acids and bases

d) It only works for weak acids

Answer: a) It resists changes in pH when small amounts of acid or base are added

52. What is the pH of a neutral solution at 25°C?

a) 14

b) 0

c) 7

d) 5

Answer: c) 7

53. The pH of a solution is 3. What is the concentration of H⁺ ions in the solution?

a) 1 × 10⁻³ M

b) 1 × 10⁻¹ M

c) 1 × 10⁻⁶ M

d) 1 × 10⁻⁷ M

Answer: a) 1 × 10⁻³ M

54. Which of the following is a correct application of buffer solutions?

a) Antacids

b) Blood regulation

c) Swimming pool maintenance

d) All of the above

Answer: d) All of the above

55. Which of the following is a Lewis acid?

a) NH₃

b) H₂O

c) AlCl₃

d) NaOH

Answer: c) AlCl₃

56. What is the conjugate base of HCl according to Bronsted-Lowry theory?

a) Cl⁻

b) H⁺

c) H₃O⁺

d) OH⁻

Answer: a) Cl⁻

57. Which of the following is an example of a Lewis base?

a) H⁺

b) Cl⁻

c) CO₂

d) AlCl₃

Answer: b) Cl⁻

58. What is the value of the pH for a solution with a H⁺ concentration of 1 × 10⁻⁶ M?

a) 6

b) 7

c) 8

d) 9

Answer: a) 6

59. A solution of ammonia (NH₃) behaves as a:

a) Lewis base

b) Bronsted-Lowry acid

c) Lewis acid

d) Bronsted-Lowry base

Answer: d) Bronsted-Lowry base

60. A buffer solution is made by mixing a weak acid with its:

a) Salt of a strong acid

b) Strong base

c) Salt of a weak base

d) Salt of the conjugate base

Answer: d) Salt of the conjugate base

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AP ECET CHEMISTRY Multiple Choice Questions (MCQs)

AP ECET Chemistry - Acids and Bases

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