Multiple choice

Which of the following is a chemical change?

  1. Rusting of iron

  2. Tempering of iron

  3. Melting of iron

  4. Bending of iron
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A Correct answer
Explanation

Rusting of iron is a chemical change because iron reacts with oxygen and water to form iron oxide (rust), which has different chemical properties than the original iron. The other options (tempering, melting, bending) are physical changes that don't alter chemical composition.

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