Answer: A: Ammonia
Ammonia refrigerant is highly toxic and flammable.
A refrigerant is a working fluid that is used in the refrigeration cycle of air conditioning systems and heat pumps, where it typically undergoes a repeated phase transition from liquid to gas and back.
Ammonia is a chemical compound of one nitrogen atom and three hydrogen atoms. The aqueous form of ammonia is known as ammonium hydroxide. This compound has a pungent smell. It is a dangerous and caustic compound. Hence, ammonia refrigerant is highly toxic and flammable.
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