Questions on Bases
20 Multiple-Choice Questions on Bases
1. Which of the following is a typical property of bases?
A) Sour taste
B) Produces H⁺ in water
C) Slippery feel
D) Turns red litmus red
E) Reacts with carbonates
2. According to Arrhenius, a base is a substance that:
A) Donates H⁺
B) Accepts H⁺
C) Produces OH⁻ in solution
D) Produces H₂ gas
E) Reacts with acids to form gases
3. Which of the following is a strong base?
A) NH₃
B) NaOH
C) Al(OH)₃
D) Mg(OH)₂
E) CH₃NH₂
4. A Bronsted-Lowry base is defined as a substance that:
A) Donates a proton
B) Accepts a proton
C) Produces hydronium ions
D) Releases gas
E) Acts as a salt
5. Which of the following is not a base?
A) NaOH
B) KOH
C) NH₃
D) HCl
E) Ca(OH)₂
6. What is the conjugate acid of the base NH₃?
A) OH⁻
B) NH₂⁻
C) NH₄⁺
D) H₂
E) H₃O⁺
7. Which of the following bases is not soluble in water?
A) NaOH
B) KOH
C) Ca(OH)₂
D) Ba(OH)₂
E) Fe(OH)₃
8. What happens when a base is added to red litmus paper?
A) No change
B) It stays red
C) Turns blue
D) Turns green
E) Dissolves
9. What is the pH range of a basic solution?
A) 0–2
B) 3–6
C) 7
D) 8–14
E) Always exactly 7
10. Which of these is a weak base?
A) NaOH
B) Ca(OH)₂
C) KOH
D) NH₃
E) Ba(OH)₂
11. Bases react with acids to form:
A) Acid and gas
B) Base and hydrogen
C) Salt and water
D) Ammonia
E) Oxides
12. What is the formula for calcium hydroxide?
A) CaOH
B) Ca(OH)
C) CaO₂H
D) Ca(OH)₂
E) Ca₂OH
13. Which of these substances is an alkali?
A) NH₄Cl
B) NaCl
C) NaOH
D) HNO₃
E) H₂SO₄
14. A base that partially dissociates in water is called:
A) A strong base
B) A weak base
C) An acid
D) A neutral substance
E) A salt
15. Bases are often found in:
A) Vinegar
B) Lemon juice
C) Soaps and detergents
D) Soda drinks
E) Fruits
16. Which of these bases is triprotic?
A) NaOH
B) NH₃
C) Ca(OH)₂
D) Al(OH)₃
E) KOH
17. Which of the following best explains why NaOH is a strong base?
A) It is organic
B) It has a high boiling point
C) It ionizes completely in water
D) It has a bitter taste
E) It neutralizes acids
18. What is the pH of a neutral solution at 25°C?
A) 1
B) 4
C) 7
D) 10
E) 14
19. A basic solution contains:
A) More H⁺ than OH⁻
B) Equal H⁺ and OH⁻
C) More OH⁻ than H⁺
D) No ions
E) Mostly salt
20. Which of the following household items is likely to be basic?
A) Vinegar
B) Lemon juice
C) Baking soda
D) Orange juice
E) Apple cider
Answer Key with Explanations
1. C – Bases feel slippery and soapy to the touch.
2. C – Arrhenius bases produce hydroxide ions (OH⁻) in aqueous solutions.
3. B – NaOH is a strong base that dissociates completely in water.
4. B – A Bronsted-Lowry base accepts a proton (H⁺).
5. D – HCl is a strong acid, not a base.
6. C – NH₄⁺ is the conjugate acid of ammonia (NH₃).
7. E – Fe(OH)₃ is largely insoluble in water.
8. C – Bases turn red litmus paper blue.
9. D – Bases have a pH greater than 7 (typically 8–14).
10. D – Ammonia (NH₃) is a common weak base.
11. C – Base + Acid → Salt + Water (neutralization).
12. D – The correct formula is Ca(OH)₂.
13. C – NaOH is a water-soluble base (alkali).
14. B – Weak bases dissociate only partially in solution.
15. C – Bases are often found in cleaning products like soaps.
16. D – Aluminum hydroxide (Al(OH)₃) can accept 3 H⁺ ions.
17. C – Strong bases dissociate completely in water.
18. C – A neutral solution has a pH of 7.
19. C – Basic solutions contain more hydroxide (OH⁻) than hydrogen (H⁺) ions.
20. C – Baking soda (sodium bicarbonate) is a basic substance.
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