HAZMAT CDL Practice Test 2026 – All-In-One Resource to Ensure Exam Success!

The classification of ammonium picrate as a flammable solid is based on its chemical properties and behavior. Ammonium picrate, also known as "picramic acid," can ignite easily and burn rapidly under certain conditions, particularly when it is in a finely divided form. Its potential to catch fire poses a significant risk during transportation and storage, hence its classification as a flammable solid.

In contrast, wetted white phosphorus is chemically reactive and can ignite spontaneously, but it is typically classified differently due to its specific properties and the state in which it is transported. Ammonium nitrate is primarily known as an oxidizing agent and is more relevant in discussions about explosive materials rather than flammable solids. Potassium cyanide, while toxic, does not possess the same flammability characteristics that would classify it as a flammable solid. Understanding the unique attributes of these substances is crucial for safely handling and transporting hazardous materials.