Which one of the following gas is used to prevent rancidity while packing oil foods?
Nitrogen
Rancidity: When oil foods interact with oxygen, it undergoes oxidation, and the food becomes unfit for consumption. This changes the taste and odor of food. This condition is called rancidity.
Nitrogen is a gas that is inert in nature; it does not react with the food due to its inert nature and helps in preventing the reaction with oxygen and increases the shelf life of the oil items.
Thus, option D is correct. Nitrogen is used to prevent rancidity while packing fatty foods.