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JAMB Chemistry 1981 Question 8

Question 8

Metals and their Compounds

For iron to rust, there should be present

  1. A.oxygen
  2. B.moisture
  3. C.carbondioxide
  4. D.oxygen and moisture
  5. E.oxygen, moisture and carbondioxide
Show the answer and explanation

Answer: D (oxygen and moisture)

Explanation

Rusting needs both oxygen (air) and water. Carbon dioxide speeds it up but is not required.