Question

Which of the following gases can be used for storage of fresh sample of an oil for a long time?
(A) Carbon dioxide or oxygen
(B) Nitrogen or oxygen
(C) Carbon dioxide or helium
(D) Helium or nitrogen

Answer 1

(D) Helium or nitrogen

To prevent rancidification of foods containing fats and oils, the packed food is surrounded by unreactive gas (like helium, nitrogen, etc.). The inert atmosphere thus created prevents oxidation of fats and oils.