[" What is the general name of the chemicals which are added to fat and oil containing foods "],[" to prevent the development of rancidity? "]

Name two anti-oxidants which are usually added to fat and oil containing foods to prevent rancidity.

What are anti-oxidants ? Why are they added to fat and oil containing foods?

What is the chemical name of 'oil of vitriol' ?

Which term is used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation (when they are kept exposed for a considerable time) ?