HAZMAT CDL Practice Test 2025 – All-In-One Resource to Ensure Exam Success!

Fluorine, Compressed is classified as a poisonous gas within Hazard Class 2 because it poses significant health risks upon exposure. This classification is based on its corrosive nature and toxic inhalation hazards, which can lead to severe respiratory complications, skin burns, and other serious health effects.

Understanding the nature of Fluorine is crucial; it is a pale yellow-green gas that is highly reactive and can be dangerous to both human health and the environment. Its toxicity warrants strict regulatory measures during transport and handling to ensure safety.

In contrast, the other substances listed do not fall under the poisonous gas category. Helium is an inert gas with generally safe properties, propane is classified as a flammable gas, and oxygen, while necessary for life, does not possess toxic qualities in its gaseous form under normal conditions. Thus, Fluorine stands out as the correct choice for being classified specifically as a poisonous gas in Hazard Class 2.