Question

The compound used as refrigerant is:
A. ${ CCl }_{ 4 }$
B. ${ COCl }_{ 2 }$
C. ${ CF }_{ 4 }$
D. $CF_{ 2 }Cl_{ 2 }$

Answer 1

Hint: The compound which was used as the refrigerant is commonly called CFCs. Now, try to recall their chemical formula using this hint.

Complete step by step answer:
We should know that the fluid which is involved in the heat pumping process during the refrigeration cycle, this fluid is called refrigerant. It is a fluid, used in a heat pump and refrigeration cycle.
In most cycles, this fluid undergoes phase transitions from a liquid to a gas and back again. Usually, it is in a liquid state and gets converted into a gaseous phase as the process proceeds.
Many working fluids have been used for such purposes. Fluorocarbons, especially chlorofluorocarbons, became commonplace for this fluid in the 20th century, but now they are being phased out because of their ozone depletion effects.

We should know that chlorofluorocarbons (It is commonly called CFCs.) were generally used as a refrigerant, but new refrigerants are developed and used nowadays. The most common refrigerant was $CF_{ 2 }Cl_{ 2 }$

Therefore, we can conclude that the correct answer to this question is option D.

Additional information: Chlorofluorocarbons are stable, nonflammable, moderately toxic gases or liquids which have typically been used as refrigerants and as aerosol propellants.

Note: We should know that other common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane.
Tetrafluoroethane, which is also known as Hydro-Fluorocarbon Type 134a, is commonly used in many modern refrigerators.
Polystyrene is used as padding within the interior of a refrigerator to keep the heat out.