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

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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.
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Correct Answer - D
Both helium (He) and nitrogen `(N_(2))` can be used since these are chemically inert. In their presence, rancidity of fresh sample of an oil will not take place.
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