Question 212Refrigeration & AC - Assistant Engineer

The correct answer is A) phosgene gas. Chlorinated fluorocarbon refrigerants, when exposed to open flames or hot surfaces, can decompose and form phosgene gas. Phosgene is a highly toxic chemical that was used as a chemical weapon in World War I. This reaction occurs because the high temperatures cause the chlorine and fluorine atoms in the refrigerant molecules to break apart, allowing them to recombine with oxygen and form phosgene. The other answer choices are incorrect because carbon monoxide is not a product of this reaction, water vapor is a common product but not the specific toxic substance formed, and petroleum crystals are not relevant to the decomposition of chlorinated fluorocarbons.