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Solution


Q.

Which of the following gases can be used for storage of fresh sample of an oil for a long time
1 Carbon dioxide  
2 Nitrogen  
3 Hydrogen  
4 Helium  

Ans.

(4)

Helium can be used to store the fresh samples of an oil for a long time since it is an inert gas and will not react with the sample of the food, keeping its quality intact as such.