Which gas is used as a refrigerant in older systems?
AFreon
BOxygen
CArgon
DNitrogen
Explanation
Freon was a common brand name for chlorofluorocarbons (CFCs) used as refrigerants in air conditioning systems, though their use has been phased out due to ozone depletion.
Exam Relevance
- Topic: Competitive Exams
- Subtopic: General Awareness
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