The term used to indicate the development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is:

47 In the context of redox reactions, the removal of hydrogen from a substance is known as: 48 The chemical reaction involved in the corrosion of iron metal is that of : 50 In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of : 51 A white precipitate can be obtained by adding dilute sulphuric acid to: