Refrigerants and Properties Questions and Answers

Q: Halogenated hydrocarbons are the preferred refrigerants for household refrigerators and air conditioning. From the following, select the correct matching of halogenated hydrocarbon and their example.

The correct match is \(HFC_{s}\)- R-134.R-134a (tetrafluoroethane) is a hydrofluorocarbon (HFC): it contains hydrogen, fluorine and carbon but no chlorine, so it does not deplete ozone, and it replaced R-12 in household refrigerators and car air conditioners.The other pairs are mismatched. R-22 is an HCFC (chlorodifluoromethane), not a CFC, and R-12 is a CFC (dichlorodifluoromethane), not an HCFC. 'HCFs' is not a refrigerant class, and R-18 is not a standard refrigerant number.

Which of the following is NOT a synthetic refrigerant in the refrigeration cycle?

A.Hydrofluorocarbon
B.Perfluorocarbon
C.Propane
D.chlorofluorocarbon

Exam Year(s)

DSSSB JE - 2023,

Answer: C

Propane (R290) is not a synthetic refrigerant. It is a natural hydrocarbon found in natural gas and petroleum, and it is used as a natural refrigerant. Hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and chlorofluorocarbons (CFCs) are all man-made halogenated compounds produced for refrigeration and other uses, so they are synthetic refrigerants.

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Halogenated hydrocarbons are the preferred refrigerants for household refrigerators and air conditioning. From the following, select the correct matching of halogenated hydrocarbon and their example.

A.\(CFC_{s}\)- R-22
B.\(HCFC_{s}\)- R-12
C.\(HFC_{s}\)- R-134
D.\(HCF_{s}\)- R-18

Exam Year(s)

RSMSSB JE - 2025, RSMSSB JE Agriculture - 2025, RSMSSB - 2025,

Answer: C

The correct match is \(HFC_{s}\)- R-134.

R-134a (tetrafluoroethane) is a hydrofluorocarbon (HFC): it contains hydrogen, fluorine and carbon but no chlorine, so it does not deplete ozone, and it replaced R-12 in household refrigerators and car air conditioners.

The other pairs are mismatched. R-22 is an HCFC (chlorodifluoromethane), not a CFC, and R-12 is a CFC (dichlorodifluoromethane), not an HCFC. 'HCFs' is not a refrigerant class, and R-18 is not a standard refrigerant number.

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