Which gases can be used for storage of fresh sample and of an oil for a long time

Helium and also nitrogen

Explanation:

Helium, as well as nitrogen, can be used for storage of a fresh sample of an oil for a long time because they prevent the oil from rancidity. The contact of air and oil is prevented by using nitrogen or helium as blanketing gas.

girl imma just put my comment here because i need a couple point okurrttt

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.