Which of the following refrigerant has the highest freezing point.
A
Ammonia
B
Carbon dioxide
C
Sulphur dioxide
D
R-12
Correct Answer: Sulphur dioxide
Sulphur dioxide has the highest freezing point.Freezing point of Ammonia is −77.7 °C
Freezing point of Carbon dioxide is −78.5 °C
Freezing point of Sulphur dioxide is −72 °C
Freezing point of R-12 is −157.7 °C