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Which one of the following is a CFC refrigerant?

1. R744
2. R290
3. R502
4. R718

Correct answer: R502

Solution

R502 is a refrigerant blend historically classified among CFC/HCFC-type refrigerants used in refrigeration systems. The other options are R744 (CO\(_2\)), R290 (propane), and R718 (water).

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