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JAMB Chemistry 2010 Question 36

Question 36

Metals and their Compounds

When iron is exposed to moist air, it gradually rusts. This is due to the formation of

  1. A.hydrated iron (III) oxide
  2. B.anhydrous iron (III) oxide
  3. C.anhydrous iron (II) oxide
  4. D.hydrated iron (II) oxide
Show the answer and explanation

Answer: A (hydrated iron (III) oxide)

Explanation

Rust is hydrated iron(III) oxide, Fe2O3.xH2O.