Question

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

Answer:

Helium or nitrogen gases can be used for storage of a fresh sample of an oil for a long time.

Option-3

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Answer 2

Helium, as well as nitrogen, can be used for storage of a fresh sample of an oil for a long time because they abstain the oil from rancidity.