Questions About Electrolytes and Nonelectrolytes
Multiple-Choice Questions – Electrolytes and Nonelectrolytes
1. What is an electrolyte?
A) A substance that melts at room temperature
B) A compound that prevents electric flow
C) A substance that conducts electricity when dissolved in water
D) A compound that evaporates easily
E) A metal alloy
2. Which of the following is a strong electrolyte?
A) Pure water
B) Glucose solution
C) Sodium chloride solution
D) Ethanol solution
E) Sugar in water
3. Nonelectrolytes are substances that:
A) Dissociate completely in water
B) Conduct electricity when melted
C) Do not conduct electricity when dissolved
D) Are always insoluble
E) Contain only metals
4. Which of the following is a nonelectrolyte?
A) KCl
B) NaOH
C) HCl
D) CH₃OH (methanol)
E) H₂SO₄
5. Electrolytes are important in the human body because they:
A) Store fat
B) Provide insulation
C) Help regulate nerve and muscle function
D) Maintain bone strength
E) Break down proteins
6. Which of these is considered a weak electrolyte?
A) HCl
B) NaCl
C) NH₃ (ammonia)
D) CaCl₂
E) KNO₃
7. What determines whether a substance is a strong or weak electrolyte?
A) Rate of reaction
B) Type of solvent
C) Degree of ionization in water
D) Boiling point
E) Color of the solution
8. Which of the following is not an electrolyte?
A) Vinegar
B) Salt solution
C) Sugar solution
D) Potassium hydroxide solution
E) Hydrochloric acid
9. What type of bond is typically found in strong electrolytes?
A) Metallic
B) Hydrogen
C) Ionic
D) Covalent nonpolar
E) Covalent polar
10. What happens to a strong electrolyte in water?
A) It remains unchanged
B) It partially ionizes
C) It conducts poorly
D) It dissociates completely into ions
E) It evaporates
11. Which of these compounds is a strong acid and strong electrolyte?
A) Acetic acid
B) NH₄OH
C) HCl
D) H₂CO₃
E) HF
12. Which of the following would produce the lowest electrical conductivity in water?
A) NaCl
B) CaCl₂
C) H₂SO₄
D) Sugar
E) KOH
13. Why do nonelectrolytes not conduct electricity in solution?
A) They form gas
B) They contain only metals
C) They do not produce free ions in water
D) They form precipitates
E) They react with water violently
14. Which substance would you expect to be a nonelectrolyte?
A) NH₄Cl
B) CH₄
C) HNO₃
D) NaBr
E) K₂SO₄
15. Which of these is not a property of electrolytic solutions?
A) Conduct electricity
B) Contain mobile ions
C) Are always colored
D) May form from ionic compounds
E) May include strong acids
16. What best describes weak electrolytes?
A) Insoluble in water
B) Conduct electricity very well
C) Dissociate only partially in water
D) Do not ionize at all
E) Always gases
17. Which solution is likely to have the highest electrical conductivity?
A) 1.0 M NaCl
B) 1.0 M CH₃OH
C) 1.0 M sugar
D) 1.0 M vinegar
E) 1.0 M NH₃
18. Which is a typical characteristic of a nonelectrolyte solution?
A) Bright light from a conductivity bulb
B) Bubbles forming
C) No light from a conductivity bulb
D) Formation of precipitate
E) Solution heating up
19. A solution that glows dimly in a conductivity test is likely:
A) A strong acid
B) A nonelectrolyte
C) A strong base
D) A weak electrolyte
E) A saturated salt solution
20. Which of the following solutions contains ions?
A) Glucose in water
B) Water and ethanol
C) NaCl in water
D) Benzene in water
E) Glycerol in water
- Questions About Solute and Solvent
- Questions on the Dissolving Process
- Questions About Liquid-Liquid Solutions
Answers with Explanations
1. C – Electrolytes conduct electricity when dissolved in water due to free ions.
2. C – NaCl is a strong electrolyte; it fully dissociates into Na⁺ and Cl⁻ in water.
3. C – Nonelectrolytes dissolve but do not produce ions, so they do not conduct electricity.
4. D – Methanol (CH₃OH) is covalent and doesn’t form ions → nonelectrolyte.
5. C – Electrolytes like Na⁺, K⁺ help nerve and muscle function.
6. C – Ammonia (NH₃) is a weak base and a weak electrolyte.
7. C – The degree of ionization in water defines strength as an electrolyte.
8. C – Sugar dissolves but doesn’t ionize → nonelectrolyte.
9. C – Ionic compounds are usually strong electrolytes.
10. D – Strong electrolytes completely dissociate into ions in water.
11. C – HCl is a strong acid and strong electrolyte.
12. D – Sugar is a nonelectrolyte and won’t conduct electricity.
13. C – No ion formation = no conductivity → nonelectrolyte.
14. B – Methane (CH₄) is nonpolar and molecular → nonelectrolyte.
15. C – Electrolytic solutions are not always colored.
16. C – Weak electrolytes partially ionize in water.
17. A – NaCl fully dissociates → high conductivity.
18. C – Nonelectrolytes do not light conductivity bulbs.
19. D – Dim glow = weak electrolyte, partial ionization.
20. C – NaCl dissolves to produce Na⁺ and Cl⁻ ions.
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