Question

Give the definition of corrosion and rancidity with example?

Answer 1

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 $\to$ 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.