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.
Solution:
(d). Both helium (He) and nitrogen (N2) can be used. In their presence, rancidity of fresh sample of an oil will not take place.