True or False: CFC refrigerants are chemically highly unstable.

CFC refrigerants, or chlorofluorocarbons, are considered chemically stable under most environmental conditions, which is why they were widely used in various applications including refrigeration and air conditioning. Their stability means they do not readily react with other substances, allowing them to perform effectively as refrigerants.

However, this stability is a double-edged sword as it also contributes to their persistence in the atmosphere. Once released, CFCs can remain in the atmosphere for several decades, during which they eventually reach the stratosphere. There, they can be broken down by ultraviolet (UV) radiation, releasing chlorine atoms that contribute to ozone depletion.

The fact that CFCs are chemically stable highlights their reliability as refrigerants but also underscores the environmental concerns associated with their use. Thus, they do not possess high chemical instability, which is the basis for determining the answer as false.