Multiple Choice
Carbon dioxide fire extinguishers are primarily designed to be used on fires involving which types of fuels?
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1. Intro to General Chemistry
Chemical Properties
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New household refrigerators may be factory charged with any of the following refrigerants, except:
A
R-134a (1,1,1,2-tetrafluoroethane)
B
R-290 (propane)
C
R-600a (isobutane)
D
R-22 (chlorodifluoromethane)
Verified step by step guidance1
Understand that the question is asking which refrigerant is NOT typically factory charged in new household refrigerators.
Review the common refrigerants used in modern household refrigerators: R-134a (1,1,1,2-tetrafluoroethane), R-290 (propane), and R-600a (isobutane) are all environmentally friendlier alternatives commonly used today.
Recognize that R-22 (chlorodifluoromethane) is an older refrigerant that has been phased out due to its ozone-depleting properties and is generally not used in new household refrigerators.
Recall that regulations such as the Montreal Protocol have led to the discontinuation of R-22 in new equipment, making it the exception in the list provided.
Conclude that the correct answer is R-22 because it is not used in new household refrigerators, unlike the other refrigerants listed.
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