Question

The compounds used as refrigerant are:
(This question has multiple correct answers)
A. $N{H_3}$
B. $CC{l_4}$
C. $C{F_4}$
D. $C{F_2}C{l_2}$
D. $C{H_2}{F_2}$

Answer 1

A refrigerant is basically a liquid that is used in heat pumps and refrigeration cycles to reduce the temperature of the heating parts. It plays an important role in the functioning of any machine that runs on higher temperature by providing the thermal headroom for the machine to perform at peak performance.

Complete step by step answer:
Now for a liquid to work like a good refrigerant, there are some properties we must take into consideration. The liquid should have good thermodynamic properties. Also, it must be non – corrosive in nature, or else it may damage the parts of the machine. Another important property is that it should be non -toxic in nature, as well non – flammable. Non-toxicity of liquid ensures that the technicians who are working with the fluid are not harmed in any way. In a broader picture, the non – toxic characteristic is important because when the refrigerant is disposed of, it should not cause any harm to nature. The property of non – flammability is necessary to ensure that at higher temperatures, the refrigerant itself does not catch fire.
Talking about the thermodynamic properties of a refrigerant, it is required to have a higher boiling point. Also, the refrigerant must have a high heat of vaporization. This ensures that at higher operation temperatures, the refrigerant does not vaporize. Also, other necessary requirements include the refrigerant to have moderate density and a high critical temperature.
From the given options, the compounds which meet all these criteria are: $N{H_3}$ and $C{F_2}C{l_2}$

Hence, Options A and D are the correct options.

Note:
Refrigerants such as ammonia (R717), carbon dioxide and non-halogenated hydrocarbons do not deplete the ozone layer and have no (ammonia) or only a low (carbon dioxide, hydrocarbons) global warming potential