A hazard class name or ID number may not be used to describe:

• A. Non-hazardous materials
• B. Hazardous materials
• C. Explosives
• D. Radioactive materials

Answer: (A)

Hazard class names and UN identification numbers exist to describe materials that pose hazards in transport. They guide labeling, packaging, and handling so everyone along the shipping chain understands the specific dangers. Only materials that are hazardous receive those classifications. Non-hazardous materials do not have a hazard class or UN number, so using a hazard-class descriptor would be inaccurate and potentially misleading. Therefore, you should not describe something that isn’t hazardous with a hazard class name or ID. Hazardous materials—such as explosives or radioactive substances—do have these classifications, so their descriptions rely on those designations.