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Which of the following refrigerant has the lowest freezing point

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Which of the following refrigerant has the lowest freezing point
1. Freon-12
2. NH3
3. CO2
4. Freon-22
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Correct Answer - Option 4 : Freon-22
Explanation:

Refrigerant No.

Name

Freezing point at atmospheric pressure (°F)

R-11

Trichlorofluoromethane

-168

Freon-12/R-12

Dichlorodifluoromethane

-252

Freon-22/R-22

Difluoromonochloromethane

-256

R-717/NH3

Ammonia

-107.9
CO2 Carbon dioxide -109

 

Among the given options, R-22 has the lowest freezing point.

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