Which of the following gases can be used as a preservative?

Oxygen

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Carbon dioxide

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Nitrogen

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Water vapour

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Solution

The correct option is C Nitrogen
Nitrogen is used in the preservation of foods. Nitrogen is added in the food containers to remove any oxygen in it and then sealed. As there is no presence of oxygen in the container, the bacteria cannot grow and hence food remains fresh.

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Which of the following is not used as a preservative?

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