WBCS.LIVE practice question

What happens to the weight of a piece of iron after it undergoes the process of rusting?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. It decreases
  2. It remains the same
  3. It increases
  4. It first increases then decreases

Correct answer and explanation

Correct answer: It increases

Explanation: ✅ Correct Answer: C) It increases 📚 Explanation: Rusting is a chemical reaction where iron reacts with oxygen and moisture from the air to form hydrated iron oxide ($Fe2O3·nH2O$). During this process, oxygen and water molecules are chemically added to the iron atoms. Because the mass of the oxygen and water is now part of the solid rust, the total weight of the rusted object is greater than the original iron.