WAEC Chemistry 2011 Objective — Question 37

Question 37 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Which of the following metals could be used as sacrificial anode for preventing the corrosion of iron?

A. A. Copper
B. B. Lead
C. C. MagnesiumCorrect
D. D. Silver

Explanation

A sacrificial anode metal must be higher than the metal it protects in the electrochemical series. Since magnesium is higher than iron in the series, it can serve as a sacrificial anode to protect iron from corrosion.

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