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Why do chips remain fresh for a longer time in a nitrogen-filled packet?

Answer and explanation

Correct answer: Nitrogen reduces the amount of oxygen in the packet and slows the oxidation of oils.

Chips contain oils and fats that can oxidise on contact with oxygen in air, causing rancidity and spoiling their taste and smell. Filling the packet with nitrogen greatly reduces the available oxygen, so oxidation of the oils is slowed and the chips remain fresh longer. Nitrogen is generally inert: it neither solidifies the oil nor reacts with it to form a preservative.

Related tags

Class 10 ScienceChemical ReactionsRancidityOxidationNitrogen PackagingFood Preservation

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