Which of the following substance can be used as a cooling agent?

Liquid Ammonia

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Liquid Hydrogen chloride

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Liquid Nitric acid

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Liquid Sulphuric acid

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Solution

The correct option is A
Liquid Ammonia

Liquid ammonia is a compound of nitrogen non-metal which is used as a coolant. The evaporation of a liquid requires heat energy. Liquid ammonia is used as a refrigerant due to the fact that when liquid ammonia vaporizes, it absorbs large quantities of heat and it also vapourises easily. For these reasons, ammonia is used as a refrigerant.

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