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Question:

What is NOT a desirable property of a good refrigerant?

A High boiling point
Explaination

Ideal Refrigerant should have a low boiling point. Refrigerant liquid should vaporize at the evaporator to cause cooling. At a higher boiling point, the compressor should be able to create too much vacuum for refrigerant to evaporate. Low specific heat & high latent heat increase the refrigeration effect for kg of refrigerant.