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

Carbon dioxide or oxygen

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Nitrogen or oxygen

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Carbon dioxide or helium

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Helium or nitrogen

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Solution

The correct option is D
Helium or nitrogen

Explanation:
Rancidity of oil: Rancidity is the oxidative degradation of oil. When oil comes in contact with air or atmospheric oxygen, it becomes rancid.
Rancidity can be prevented by supplying gases such as helium or nitrogen.
Helium acts as inert gas and does not react with other substances.
Nitrogen is less reactive than helium and is most commonly used in packets to avoid rancidity.
Hence, the correct option is (D).

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