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Question

Give the definition of corrosion and rancidity with example?


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Solution

Corrosion:

  • It is a natural process.
  • It is the process in which metals deteriorate gradually by the reaction of oxygen and water and forming an oxide layer on the surface of the metal.
  • Due to corrosion pure metal is converted into an undesirable substance.
  • In the case of iron, it is called rusting.
  • When a piece of iron is left out in moist air, it slowly changes into a dull brittle brown substance called rust (Fe2O3.xH2O).
  • The formation of rust on the surface of iron is called the rusting of iron.
  • Chemical reaction:
  • Fe2O3 + xH2O Fe2O3.xH2O

Rancidity:

  • The term ‘rancidity’ means a condition in which food has become undesirable.
  • It is often used to describe the oxygen content of oils.
  • It is a term used to describe the oxygen damage in food.
  • When oxygen molecules interact with the oil and food, the normal structure of the food is disturbed, resulting in a change in odor and taste, and it is not recommended for consumption.

For example, An example of rancidity is when a chips packet is exposed to atmospheric air which results in a change in taste and odor.


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