___________ materials may cause severe chemical burns and extensive tissue damage on contact

• A. Corrosive
• B. Toxic
• C. Explosive
• D. Irritant

Answer: (A)

Materials that destroy or damage living tissue on contact do so through a chemical action that breaks down cells and tissues. These substances are corrosive, and their defining danger is the ability to cause severe chemical burns and extensive tissue damage almost immediately when they touch skin, eyes, or mucous membranes. This is what makes corrosives stand out: the harm comes from the chemical reaction with tissue itself, not from systemic poisoning or an explosive release of energy.

By contrast, toxic materials are dangerous because of adverse health effects after absorption, inhalation, or ingestion, not necessarily immediate burns on contact. Explosive substances pose a hazard from a rapid release of energy, shock, and fragmentation. Irritants may cause inflammation or discomfort, but they generally do not produce deep, irreversible tissue destruction like corrosives do.