(i) What is rancidity?
(ii) Suggest two methods to reduce the problem of rancidity.
(iii) How is corrosion different from rusting?’
Answers
Explanation:
1.Fats and oil containing food kept for long time get oxidisedand become rancid ad taste of food changes and causes infection on eating.This is called RANCIDITY
2.Adding antioxidants (substances which prevent oxidation) to food.
Storing food in airtight containers to slow the process of rancidification.
Refrigerating food also helps to slow down rancidification.
3.Corrosion: Corrosion is the process of deterioration of a substance due to chemical, electrochemical or other reactions that take place on the surface of that substance.
Rusting: Rusting is the red or orange coating that forms on the surface of iron when exposed to air and moisture.
Surface
Corrosion: Corrosion can occur on different surfaces such as skin, wood, metals, etc.
Rusting: Rusting mainly occurs on surfaces of iron and steel.
Causes
Corrosion: Corrosion can happen due to exposure to air or spread of chemicals on the surface.
Rusting: Rusting can happen due to exposure to air and moisture.
Examples
Corrosion: Corrosion can be observed as a skin burn, wood surface destruction or rusting.
Rusting: Rusting can be observed as red or orange coating on the surface.
Hello Dost ☺
Answer :
Corrosion – The process of slow conversion of metals into their undesirable compounds due to their reaction with oxygen, water, acids, gases etc. present in the atmosphere is called corrosion.
Rusting – Iron when reacts with oxygen and moisture forms red substance called rust.
Rancidity – The taste and odour of food materials containing fat and oil changes when they are left exposed to air for long time. This is called rancidity.
It is caused due to oxidation of fat and oil present in food material.
It can be prevented by using various methods such as by adding antioxidants to the food materials, Storing food in air tight container and by flushing out air with nitrogen.
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