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JAMB Chemistry 1990 Question 27

Question 27

Electrolysis

Iron galvanized with zinc is cathodically protected from corrosion. This is because

  1. A.zinc has a more positive oxidation potential than iron
  2. B.zinc has a less positive oxidation potential than iron
  3. C.both have the same oxidation potential
  4. D.zinc is harder than iron.
Show the answer and explanation

Answer: A (zinc has a more positive oxidation potential than iron)

Explanation

Zinc is higher in the activity series, so it loses electrons more easily than iron (more positive oxidation potential). Zinc corrodes instead of the iron.