WAEC Chemistry 2021 Objective — Question 5
Question 5 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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5. Cathodic protection of metals is based on
- A. standard electrode potential of hydrogen.
- B. its electrical conductivity.
- C. nature of oxides formed.
- D. relative tendencies of oxidation.Correct
Explanation
Cathodic (sacrificial) protection works by attaching a more reactive metal that oxidises preferentially, based on relative tendencies of oxidation in the electrochemical series.
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