What harmful substance is produced when r12 is burned?

When R-12, also known as dichlorodifluoromethane, is burned, it can decompose at high temperatures, resulting in the formation of phosgene gas. Phosgene is a toxic compound that can be extremely harmful if inhaled. It was historically used as a chemical warfare agent during World War I and is dangerous even in small amounts.

The presence of chlorine in R-12 is significant, as it contributes to the chemical reactions that produce phosgene when the refrigerant is subjected to combustion or very high heat. Understanding this risk is crucial for safe handling and disposal of refrigerants like R-12. Other choices, while related to combustion processes, do not arise specifically from burning R-12. For instance, carbon dioxide is a common combustion product of organic materials, but it is not a unique byproduct of R-12. Methane and nitrogen oxides can also be produced in various combustion processes, but they are not directly related to the burning of R-12. Therefore, the correct identification of phosgene gas underscores the importance of safety procedures when dealing with refrigerants and their potential hazards.