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Standard VII
Chemistry
Chemical Change
Question

Which of the following is a chemical change?
  1. Melting of ice to give water
  2. Boiling of water to give water vapor.
  3. Dissolution of salt is water
  4. Rusting of iron

A
Melting of ice to give water
B
Dissolution of salt is water
C
Rusting of iron
D
Boiling of water to give water vapor.
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Solution
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Rusting is the process by which iron changes to hydrated iron oxide or rust when iron comes in contact with oxygen and water. Since, a new chemical substance is formed in this process, it is a chemical change.

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