Which of the following is NOT a class of hazardous material?

• A. Flammable liquids
• B. Corrosives
• C. Biodegradable materials
• D. Toxic substances

Answer: (C)

The correct answer highlights that biodegradable materials are not classified as a class of hazardous materials. Hazardous materials are typically classified based on their physical and chemical properties that pose a risk to health and safety.

Classes of hazardous materials include flammable liquids, which can ignite easily and pose fire hazards; corrosives, which can cause destruction of living tissue or severe corrosion of materials upon contact; and toxic substances, which can be harmful or fatal when ingested, inhaled, or absorbed.

Biodegradable materials, on the other hand, generally refer to substances that decompose naturally through the action of living organisms, such as bacteria or fungi, and do not possess hazardous characteristics related to toxicity, flammability, or corrosion. This distinction makes it clear that biodegradable materials, while they may have environmental considerations, do not fit into the established classes of hazardous materials as outlined in safety regulations.