Which hazmat class includes explosive articles, substances, and pyrotechnic devices such as fireworks and ammunition?

• A. Class One - Explosives
• B. Class Two - Gases
• C. Class Three - Flammable Liquids
• D. Class Seven - Radioactive Material

Answer: (A)

The main idea here is hazmat classification by hazard type. Explosives is the class that covers materials designed to release energy rapidly, including explosive articles, substances, and pyrotechnic devices like fireworks and ammunition. These items are grouped together because their primary danger comes from a sudden energy release that can cause blasts, shattering force, and shock waves.

The other options don’t fit because they refer to different hazards: gases (Class 2) are about compressed, liquefied, or dissolved gases; flammable liquids (Class 3) are liquids with flammable properties; radioactive material (Class 7) involves ionizing radiation.