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JAMB Chemistry 1989 Question 37

Question 37

Metals and their Compounds

The scale of a chemical balance is made of iron plate and coated with copper electrolytically because

  1. A.iron is less susceptible to corrosion than copper
  2. B.copper is twice as susceptible to corrosion as iron
  3. C.copper is less susceptible to corrosion than iron
  4. D.copper and iron are equally susceptible to corrosion
Show the answer and explanation

Answer: C (copper is less susceptible to corrosion than iron)

Explanation

Copper is less reactive than iron and corrodes much less, so a copper coating protects the iron from rusting.