WAEC Chemistry 2021 Objective — Question 26

Question 26 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

26. Which of the following half reaction equations represent the reaction at the cathode?

• A. A3+(aq)+3e⁻→A(s)
• B. B2+(aq)+2e⁻→B(s)Correct
• C. A(s)→A3+(aq)+3e⁻
• D. B(s)→B2+(aq)+2e⁻

Explanation

At the cathode, reduction occurs. B2+ gains 2 electrons to form B(s): B2+(aq)+2e⁻→B(s).

Advertisement