Question

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

Options

• Carbon dioxide or oxygen

• Nitrogen or oxygen

• Carbon dioxide or helium

• Helium or nitrogen

Answer 1

Helium or nitrogen

Explanation - 

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