|Class 10 Chemistry Chemical Reactions and Equations||Rancidity|
It is generally observed that when oily food items are kept for longer time they start to smell very bad. This happens because the fats and oils get oxidised and hence they become rancid that changes their taste and smell.
To avoid such spoilage antioxidants are added to oily food items. Food items can also be prevented from getting oxidised by keeping them in air tight packets. Due to this reason packets of chips are flushed with gas such as nitrogen that acts as antioxidant and prevents spoilage of the fried chips.
Fig. Packet of chips flushed with nitrogen