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

NCERT Class X
Science - Exemplar Problems

Chapter_Chemical Reactions And Equations

Answer 1

Because of Rancidity the food made with oil or sample of oil stored for long time gets spoiled. Makes the oil unfit for usage.
So to prevent from rancidity of oil , oil can be packed by flushing with unreactive gas like Nitrogen or Helium so that oil can be preserved for longer time.
So correct option is D.

Answer 2

Option d is correct