WAEC Chemistry 2025 Objective — Question 24
Question 24 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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In the electrolysis of dilute hydrochloric acid,
- A. oxygen gas is given off at the anodeCorrect
- B. hydrogen gas is given off at the anode
- C. chlorine gas is given off at the anode
- D. hydrogen chloride gas is given off at the anode
Explanation
In the electrolysis of dilute hydrochloric acid, oxygen is produced at the anode while hydrogen is produced at the cathode. At the anode: 4OH- -> 2H2O + O2 + 4e-. At the cathode: 2H+ + 2e- -> H2.
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