Questions on Bases
20 multiple choice questions on the topic of bases, ideal for middle or high school chemistry students. The answers are provided at the end.
Multiple Choice Questions: Bases
1. What is a base?
A) A compound that releases H⁺ ions in water
B) A compound that turns blue litmus paper red
C) A compound that releases OH⁻ ions in water
D) A compound that tastes sour
2. Which of the following is a common property of bases?
A) Sour taste
B) Slippery feel
C) Red color in litmus test
D) Reacts with metals to form hydrogen gas
3. What ion do bases produce in aqueous solution?
A) H⁺
B) OH⁻
C) Na⁺
D) Cl⁻
4. Which of the following is a strong base?
A) Ammonia
B) Sodium hydroxide
C) Calcium carbonate
D) Baking soda
5. What is the pH range of bases?
A) 0–7
B) Exactly 7
C) 7–14
D) 1–6
6. Which base is commonly found in household cleaning products?
A) Citric acid
B) Sodium hydroxide
C) Hydrochloric acid
D) Sulfuric acid
7. What happens when a base reacts with an acid?
A) Hydrogen gas is released
B) Salt and water are formed
C) The base turns red
D) The pH drops to 1
8. Which of the following bases is used in antacids?
A) Sodium hydroxide
B) Ammonia
C) Magnesium hydroxide
D) Nitric acid
9. What color does red litmus paper turn in a basic solution?
A) Yellow
B) Green
C) Blue
D) Red
10. Which of these is a weak base?
A) Sodium hydroxide
B) Calcium hydroxide
C) Ammonia
D) Potassium hydroxide
11. What is the chemical formula for sodium hydroxide?
A) NaCl
B) NaOH
C) H₂SO₄
D) NH₄OH
12. Which base is used in soap making?
A) Hydrochloric acid
B) Sodium hydroxide
C) Acetic acid
D) Nitric acid
13. Ammonia is an example of a:
A) Weak base
B) Strong base
C) Neutral compound
D) Salt
14. What is the common name for sodium bicarbonate?
A) Caustic soda
B) Baking soda
C) Epsom salt
D) Washing soda
15. Which base is used in the manufacture of bleach?
A) Sodium hydroxide
B) Calcium hydroxide
C) Ammonia
D) Potassium hydroxide
16. Which of these is NOT a base?
A) NaOH
B) NH₃
C) HCl
D) Ca(OH)₂
17. What is the taste associated with bases?
A) Sweet
B) Sour
C) Bitter
D) Salty
18. Bases neutralize:
A) Other bases
B) Acids
C) Salts
D) Metals
19. Which base is used in the production of cement?
A) Magnesium hydroxide
B) Potassium hydroxide
C) Calcium hydroxide
D) Ammonia
20. What is the pH of a very strong base?
A) 1
B) 7
C) 10
D) 14
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Answer Key
1. C) A compound that releases OH⁻ ions in water
2. B) Slippery feel
3. B) OH⁻
4. B) Sodium hydroxide
5. C) 7–14
6. B) Sodium hydroxide
7. B) Salt and water are formed
8. C) Magnesium hydroxide
9. C) Blue
10. C) Ammonia
11. B) NaOH
12. B) Sodium hydroxide
13. A) Weak base
14. B) Baking soda
15. A) Sodium hydroxide
16. C) HCl
17. C) Bitter
18. B) Acids
19. C) Calcium hydroxide
20. D) 14
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