Which refrigerant has an Ozone Depletion Potential (ODP) value of 1?

The refrigerant with an Ozone Depletion Potential (ODP) value of 1 is CFC-11. ODP is a measure of the ability of a substance to deplete the ozone layer compared to a reference substance, usually trichlorofluoromethane (CFC-11). An ODP of 1 indicates that the substance has the same potential to contribute to ozone depletion as CFC-11.

CFC-12 has an ODP of 0.82, indicating that it is less damaging to the ozone layer than CFC-11. HCFC-22 has a lower ODP value of 0.05, which means it has a much lesser impact on ozone depletion compared to CFC-11. R-410A is a blend of refrigerants that has an ODP of 0, reflecting that it does not contribute to ozone layer depletion.

Thus, the correct choice aligns with CFC-11's full ODP value of 1, illustrating its significant historical role in ozone depletion concerns.