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Doctors Medicines MCQs Q&A

  1. Only I
  2. Only II
  3. Both I and II
  4. Neither I nor II
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1 Answers

Option 3 : Both I and II

The correct answer is Both I and II.

  • The presence of both oxygen and water or water vapor is essential for rusting.
  • Rust is formed from the reaction between oxygen and iron in an environment containing water vapour.
  • Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide.
  • Iron + Water + Oxygen → Hydrated iron(III) oxide.
  • 4Fe + 3O2 + 6H2O → 4Fe(OH)3
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