IBEC ELECTROLYSIS & LASER STATE TEST
COMPREHENSIVE EXAMINATION 2026/2027 |
VERIFIED QUESTIONS
SECTION A: ELECTROLYSIS (Questions 1–75)
1. What is electrolysis?
• A. Spontaneous chemical reaction in a galvanic cell
• B. Chemical decomposition by passing electric current through an
electrolyte
• C. Emission of light from a semiconductor
• D. Separation of isotopes by laser
Correct Answer: B
Rationale: Electrolysis uses electrical energy to drive a non-
spontaneous chemical reaction in an electrolyte.
2. An electrolyte is a substance that:
• A. Conducts electricity by moving electrons only
• B. Conducts electricity when molten or in aqueous solution due to mobile
ions
• C. Does not conduct electricity in any state
• D. Is always a solid metal
Correct Answer: B
Rationale: Electrolytes contain mobile ions when molten or dissolved,
allowing ionic conduction.
3. Which is a non-electrolyte?
• A. NaCl solution
, • B. Molten NaCl
• C. Sugar solution
• D. Dilute H₂SO₄
Correct Answer: C
Rationale: Sugar dissolves as neutral molecules and does not provide
mobile ions.
4. In an electrolytic cell, the cathode is:
• A. Positive
• B. Negative
• C. Neutral
• D. Alternating
Correct Answer: B
Rationale: In electrolysis, the cathode is connected to the negative
terminal of the power supply.
5. In an electrolytic cell, the anode is:
• A. Positive
• B. Negative
• C. Neutral
• D. Ground
Correct Answer: A
Rationale: The anode is connected to the positive terminal in an
electrolytic cell.
6. Oxidation occurs at the:
• A. Cathode
• B. Anode
, • C. Salt bridge
• D. Voltmeter
Correct Answer: B
Rationale: Oxidation is loss of electrons and occurs at the anode.
7. Reduction occurs at the:
• A. Anode
• B. Cathode
• C. Electrolyte surface
• D. Power supply
Correct Answer: B
Rationale: Reduction is gain of electrons and occurs at the cathode.
8. In electrolysis, cations migrate toward the:
• A. Anode
• B. Cathode
• C. Both electrodes equally
• D. Neither electrode
Correct Answer: B
Rationale: Cations are positively charged and move toward the negative
cathode.
9. In electrolysis, anions migrate toward the:
• A. Cathode
• B. Anode
• C. Neither electrode
• D. Salt bridge
Correct Answer: B
, Rationale: Anions are negatively charged and move toward the positive
anode.
10. Electrolysis of molten NaCl produces what at the cathode?
• A. Cl₂
• B. Na
• C. H₂
• D. O₂
Correct Answer: B
Rationale: Na⁺ ions are reduced to sodium metal at the cathode.
11. Electrolysis of molten NaCl produces what at the anode?
• A. Na
• B. Cl₂
• C. H₂
• D. O₂
Correct Answer: B
Rationale: Cl⁻ ions are oxidized to chlorine gas at the anode.
12. Electrolysis of acidified water produces what at the cathode?
• A. O₂
• B. H₂
• C. Cl₂
• D. SO₂
Correct Answer: B
Rationale: H⁺ ions are reduced to hydrogen gas at the cathode.
13. Electrolysis of acidified water produces what at the anode?
• A. H₂
COMPREHENSIVE EXAMINATION 2026/2027 |
VERIFIED QUESTIONS
SECTION A: ELECTROLYSIS (Questions 1–75)
1. What is electrolysis?
• A. Spontaneous chemical reaction in a galvanic cell
• B. Chemical decomposition by passing electric current through an
electrolyte
• C. Emission of light from a semiconductor
• D. Separation of isotopes by laser
Correct Answer: B
Rationale: Electrolysis uses electrical energy to drive a non-
spontaneous chemical reaction in an electrolyte.
2. An electrolyte is a substance that:
• A. Conducts electricity by moving electrons only
• B. Conducts electricity when molten or in aqueous solution due to mobile
ions
• C. Does not conduct electricity in any state
• D. Is always a solid metal
Correct Answer: B
Rationale: Electrolytes contain mobile ions when molten or dissolved,
allowing ionic conduction.
3. Which is a non-electrolyte?
• A. NaCl solution
, • B. Molten NaCl
• C. Sugar solution
• D. Dilute H₂SO₄
Correct Answer: C
Rationale: Sugar dissolves as neutral molecules and does not provide
mobile ions.
4. In an electrolytic cell, the cathode is:
• A. Positive
• B. Negative
• C. Neutral
• D. Alternating
Correct Answer: B
Rationale: In electrolysis, the cathode is connected to the negative
terminal of the power supply.
5. In an electrolytic cell, the anode is:
• A. Positive
• B. Negative
• C. Neutral
• D. Ground
Correct Answer: A
Rationale: The anode is connected to the positive terminal in an
electrolytic cell.
6. Oxidation occurs at the:
• A. Cathode
• B. Anode
, • C. Salt bridge
• D. Voltmeter
Correct Answer: B
Rationale: Oxidation is loss of electrons and occurs at the anode.
7. Reduction occurs at the:
• A. Anode
• B. Cathode
• C. Electrolyte surface
• D. Power supply
Correct Answer: B
Rationale: Reduction is gain of electrons and occurs at the cathode.
8. In electrolysis, cations migrate toward the:
• A. Anode
• B. Cathode
• C. Both electrodes equally
• D. Neither electrode
Correct Answer: B
Rationale: Cations are positively charged and move toward the negative
cathode.
9. In electrolysis, anions migrate toward the:
• A. Cathode
• B. Anode
• C. Neither electrode
• D. Salt bridge
Correct Answer: B
, Rationale: Anions are negatively charged and move toward the positive
anode.
10. Electrolysis of molten NaCl produces what at the cathode?
• A. Cl₂
• B. Na
• C. H₂
• D. O₂
Correct Answer: B
Rationale: Na⁺ ions are reduced to sodium metal at the cathode.
11. Electrolysis of molten NaCl produces what at the anode?
• A. Na
• B. Cl₂
• C. H₂
• D. O₂
Correct Answer: B
Rationale: Cl⁻ ions are oxidized to chlorine gas at the anode.
12. Electrolysis of acidified water produces what at the cathode?
• A. O₂
• B. H₂
• C. Cl₂
• D. SO₂
Correct Answer: B
Rationale: H⁺ ions are reduced to hydrogen gas at the cathode.
13. Electrolysis of acidified water produces what at the anode?
• A. H₂
