. 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
 

Best Answer

Answer: (d) Helium or nitrogen

Explanation:
 
Oxygen cannot be used as it is an oxidizing agent. Helium can be used as it is an inert gas. Nitrogen is less reactive and it is cheaper than Helium. In most cases, nitrogen is used in packet to prevent rancidity.

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