Which of the following is an example of hazmat that would be classified and placarded Class 9 during transportation?

• A. Molten sulfur
• B. Gasoline
• C. Lime slurry
• D. Chlorine gas

Answer: (A)

Class 9 is for miscellaneous dangerous goods—hazards that don’t fit into the other specific classes. Molten sulfur fits this category because its hazard arises from being in a molten, high-temperature state during transport, a condition that doesn’t neatly match flammable liquids (Class 3) or toxic gases (Class 2.3). That unique, nonstandard hazard is why it’s placarded as Class 9. In contrast, gasoline is classified as a flammable liquid (Class 3) and chlorine gas is a toxic gas (Class 2.3). Lime slurry isn’t typically a Class 9 miscellaneous dangerous good, since it’s usually managed under a different hazard class depending on its exact properties.