Chemistry 12 — U5 Practice Exam MCQ¶
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创建日期: 2026-03-14 最后更新: 2026-03-16
使用说明¶
- 题目数量：17 道选择题（Multiple Choice Questions）
- 来源：StudyForge — Quiz 11440-152507 (U5 Practice Exam)
- 答案位置：每题下方附 Answer
- 覆盖范围：Unit 5 — Acids and Bases
Q1. A net equation for the reaction between CH₃COOH and KOH is
(A) CH₃COOH(aq) + K⁺(aq) + OH⁻(aq) → H₂O(l) + KCH₃COO(aq) (B) CH₃COO⁻(aq) + K⁺(aq) ⇌ CH₃COOK(aq) (C) CH₃COOH(aq) + OH⁻(aq) → H₂O(l) + CH₃COO⁻(aq) (D) CH₃COOH(aq) + KOH(aq) → H₂O(l) + CH₃COOK(aq)
Answer: (C)
Q2. Consider the following equilibrium constant expression:
This expression represents the
(A) Kb for HS⁻ (B) Ka for H₂S (C) Ka for HS⁻ (D) Kb for H₂S
Answer: (A)
Q3. Which of the following is the weakest acid?
(A) HClO₃ (B) HClO₂ (C) HClO (D) HClO₄
Answer: (C)
Q4. Which of the following is amphiprotic in water?
(A) SO₂ (B) HSO₃⁻ (C) H₂SO₃ (D) SO₃²⁻
Answer: (B)
Q5. The pOH of an aqueous solution is equal to
(A) pKw − pH (B) −log[H₃O⁺] (C) 14 + pH (D) −log pKw
Answer: (A)
Q6. Water acts as a base when it reacts with
(A) NH₃ (B) NH₄⁺ (C) NO₂⁻ (D) CN⁻
Answer: (B)
Q7. The [OH⁻] in 0.050 M HNO₃ at 25°C
(A) 5.0 × 10⁻² M (B) 5.0 × 10⁻¹⁶ M (C) 1.0 × 10⁻¹⁴ M (D) 2.0 × 10⁻¹³ M
Answer: (D)
Q8. The reaction of a strong acid with a strong base produces
(A) a non-metallic oxide and water (B) a metallic oxide and water (C) a salt and water (D) a base and an acid
Answer: (C)
Q9. The [OH⁻] is greater than the [H₃O⁺] in
(A) NH₃(aq) (B) CH₃COOH(aq) (C) HCl(aq) (D) H₂O(aq)
Answer: (A)
Q10. Drano, a commercial product used to clean drains, contains small bits of aluminum metal and
(A) ammonia (B) hydrochloric acid (C) sodium hydroxide (D) acetic acid
Answer: (C)
Q11. Which of the following equations correctly relates pH and [H₃O⁺]?
(A) pH = log[H₃O⁺] (B) pH = pKw − [H₃O⁺] (C) pH = 14 − [H₃O⁺] (D) pH = −log[H₃O⁺]
Answer: (D)
Q12. Consider the following equilibrium:
The stronger acid is
(A) HC₂O₄⁻ (B) H₂S (C) H₂C₂O₄ (D) HS⁻
Answer: (C)
Q13. The pH of 0.15 M HCl is
(A) 0.71 (B) 13.18 (C) 0.82 (D) 0.15
Answer: (C)
Q14. Consider the following equilibria:
I. HCO₃⁻ + H₂O ⇌ H₂CO₃ + OH⁻
II. NH₄⁺ + H₂O ⇌ H₃O⁺ + NH₃
III. HSO₃⁻ + H₃O⁺ ⇌ H₂O + H₂SO₃
Water acts as a Brønsted-Lowry base in
(A) III only (B) I and II only (C) I, II and III (D) II and III only
Answer: (D)
Q15. The [H₃O⁺] is greater than the [OH⁻] in
(A) NH₄⁺(aq) (B) H₂O(aq) (C) NaOH(aq) (D) NH₃(aq)
Answer: (A)
Q16. The concentration, Ka and pH values of four acids are given in the following table:
Based on this data, the strongest acid is
(A) HC (B) HD (C) HA (D) HB
Answer: (D)
Q17. The conjugate base of H₂BO₃⁻ is
(A) HBO₃²⁻ (B) BO₃³⁻ (C) H₃BO₃ (D) H₃BO₃⁻
Answer: (A)