व्हिच ऑफ द फॉलोइंग गैसेस इस हाइजीनिक
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Answer:
helium
Explanation:
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. The contact of air and oil is prevented by using nitrogen or helium as blanketing gas.
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