Gas used as a refrigerant is:

Nitrogen

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Oxygen

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Hydrogen

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Water gas

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Solution

The correct option is A Nitrogen
NITROGEN is used as a refrigerant. Nitrogen is a liquid at temperatures below $- {196.5}^{0} C$ and is used as a refrigerant for such things as preservation of blood and cooling of large computer systems, as well as some industrial uses. Being a liquid, it is more convenient to use for low-temperature cooling than dry ice. Liquid nitrogen is also used in oil wells to build up pressure in order to force crude oil upward.

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