Air And Water Pollution Control (AWPC) Exam 1 Practice

Which term describes the properties 'large molecules, planar, lots of halogens, inert, and resistant to photolysis'?

Biodegradable characteristics Hydrophobic traits Persistence traits Foreign characteristics

Correct Answer:

Foreign characteristics

Explanation:

These properties point to a substance that is foreign to the environment and highly persistent. Large, planar molecules rich in halogens tend to be chemically stable and resist breakdown by light and natural processes. Being inert and resistant to photolysis further reduces their chances of degradation, so they stay in the environment longer. The idea of “foreign characteristics” emphasizes that the compound is not naturally produced in the ecosystem, i.e., xenobiotic, which is why this term fits best. Biodegradable would imply easy breakdown, hydrophobic describes solubility aspects, and persistence traits describe longevity but not origin; the question specifically highlights the environmental origin as the distinguishing factor.

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