R-123 replaced R-11 in many low-pressure chillers. How is R-123 classified?
Environmental impacts · EPA 608 Core. The correct answer, and the reasoning behind it.
How CFCs and HCFCs destroy stratospheric ozone, and what that does to health and the environment.
The question
R-123 replaced R-11 in many low-pressure chillers. How is R-123 classified?
- HCFCCorrect answer
- CFC
- HFC
- Hydrocarbon
Why “HCFC” is correct
R-123 is a hydrochlorofluorocarbon. It contains chlorine and so still depletes ozone, but far less than the CFC R-11 it replaced. Like other HCFCs, it is being phased out.
Source: EPA: Test Topics
Why the other answers are wrong
- CFC — R-11 is the CFC; R-123 contains hydrogen as well.
- HFC — R-123 contains chlorine, so it is not an HFC.
- Hydrocarbon — R-123 contains chlorine and fluorine, so it is not a hydrocarbon.
Practice more of this
More EPA 608 Core practice questions, or see every EPA 608 practice test.
Unofficial, not affiliated with the EPA or any EPA-approved certifying organization. Questions are original practice written from public EPA material, not real exam questions.