Questions on Acids
20 Multiple-Choice Questions on Acids
1. Which of the following is a typical property of acids?
A) Bitter taste
B) Slippery feel
C) Turns red litmus blue
D) Produces hydrogen ions in water
E) Neutralizes bases to form water and salt
2. Which of the following is a strong acid?
A) Acetic acid
B) Hydrochloric acid
C) Citric acid
D) Carbonic acid
E) Formic acid
3. According to the Arrhenius definition, an acid is a substance that:
A) Accepts a proton
B) Increases the hydroxide ion concentration
C) Donates a proton
D) Increases the hydrogen ion concentration in water
E) Forms salt and water with metals
4. A Bronsted-Lowry acid is defined as a substance that:
A) Accepts H⁺
B) Donates H⁺
C) Produces OH⁻
D) Accepts electrons
E) Forms hydrogen gas
5. Which of these is not an acid?
A) HCl
B) H₂SO₄
C) NaOH
D) HNO₃
E) CH₃COOH
6. The pH of a strong acid solution is generally:
A) Close to 14
B) Between 7 and 14
C) Exactly 7
D) Between 0 and 3
E) Close to 10
7. Which of these acids is a weak acid?
A) HCl
B) HNO₃
C) H₂SO₄
D) HClO₄
E) CH₃COOH
8. What happens when an acid reacts with a metal like zinc?
A) Forms only a salt
B) Produces water
C) Produces hydrogen gas and salt
D) Forms a base
E) No reaction
9. What is the conjugate base of the acid H₂SO₄?
A) HSO₄⁻
B) SO₄²⁻
C) OH⁻
D) H₃O⁺
E) H⁺
10. Which of these acids is triprotic (can donate three protons)?
A) HCl
B) H₂SO₄
C) HNO₃
D) H₃PO₄
E) CH₃COOH
11. Acids react with carbonates to produce:
A) Salt and hydrogen
B) Salt and carbon dioxide
C) Only water
D) Hydroxide ions
E) Ammonia
12. Which of the following is not a characteristic of acids?
A) Sour taste
B) Corrosiveness
C) Changes litmus red
D) Produces hydroxide ions
E) Reacts with bases
13. Which of these is the correct formula for nitric acid?
A) HNO₂
B) HNO₃
C) H₂NO₃
D) H₂N₂O₃
E) HNO₄
14. Which of these acids is found in the stomach and helps digestion?
A) Sulfuric acid
B) Nitric acid
C) Acetic acid
D) Hydrochloric acid
E) Citric acid
15. An acid that only partially ionizes in solution is called:
A) Strong acid
B) Weak base
C) Weak acid
D) Non-electrolyte
E) Buffer
16. What is the pH of a neutral solution at 25°C?
A) 1
B) 3
C) 5
D) 7
E) 9
17. The strength of an acid depends on:
A) The temperature of the solution only
B) The number of protons in the nucleus
C) The concentration of the acid
D) The degree of ionization in water
E) The atomic mass of the acid
18. Which statement best describes an acid-base neutralization reaction?
A) Two acids produce water
B) An acid and a base react to form water and salt
C) An acid decomposes into ions
D) A base forms a precipitate
E) An acid reacts with metal to form gas
19. Which of these is not an organic acid?
A) Acetic acid
B) Citric acid
C) Formic acid
D) Sulfuric acid
E) Lactic acid
20. The sour taste of many foods (like lemons or vinegar) is due to the presence of:
A) Bases
B) Esters
C) Acids
D) Salts
E) Sugars
Answer Key with Explanations
1. D – Acids produce hydrogen ions (H⁺) in aqueous solutions.
2. B – Hydrochloric acid (HCl) is a strong acid; it dissociates completely in water.
3. D – Arrhenius acids increase the concentration of H⁺ ions in water.
4. B – Bronsted-Lowry acids are proton (H⁺) donors.
5. C – NaOH is a base, not an acid.
6. D – Strong acids have low pH values, typically between 0 and 3.
7. E – Acetic acid (CH₃COOH) is a weak acid; it only partially ionizes in solution.
8. C – Acids reacting with active metals like zinc produce hydrogen gas and salt.
9. A – When H₂SO₄ loses one H⁺, it forms the conjugate base HSO₄⁻.
10. D – Phosphoric acid (H₃PO₄) is triprotic; it can donate three protons.
11. B – Acid + carbonate → salt + CO₂ + water.
12. D – Producing hydroxide ions is a property of bases, not acids.
13. B – The correct formula for nitric acid is HNO₃.
14. D – Hydrochloric acid (HCl) is present in gastric juice.
15. C – Weak acids only partially ionize in solution.
16. D – Neutral pH at 25°C is 7.
17. D – Acid strength is defined by how much it ionizes in solution.
18. B – Acid + base → salt + water = neutralization.
19. D – Sulfuric acid is an inorganic acid.
20. C – Acids give the sour taste to foods.
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