Q. The substance commonly employed as a cooling agent in refrigerators is

A
Liquid Ammonia
B
Nitrogen
C
Helium
D
None of these
Solution:

Liquid ammonia acts as a refrigerant in ice plants. Evaporation of a liquid needs heat energy. When liquid ammonia vaporizes, it absorbs large quantities of heat without changing its temperature. For these reasons, ammonia is widely used as a refrigerant

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