Which of the following gases can be used for the storage of a fresh sample of oil for a long time?

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Carbon dioxide or oxygen

Nitrogen or oxygen

Carbon dioxide or helium

Helium or nitrogen

answer is D.

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Detailed Solution

Helium and nitrogen gases can be used to store a fresh sample of oil for a long time.
Helium (He) and nitrogen (N) are both gases that are inert in nature; that is, they are unreactive. When an unreactive gas surrounds the packed food, there is no oxygen to cause its oxidation and make it rancid. Hence, helium or nitrogen gases can be used to store a fresh sample of oil for a long time.

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