When a substance can decompose explosively only under certain conditions, it is classified as?

• A. Normally stable
• B. Volatile
• C. Unstable
• D. Potentially explosive

Answer: (D)

The classification of a substance that can decompose explosively only under certain conditions as "potentially explosive" is appropriate because it indicates that while the substance may generally be stable or safe under normal circumstances, there exists a possibility of explosive decomposition when specific triggering factors are present. This term encompasses substances that require particular conditions—such as changes in temperature, pressure, or the presence of other chemicals—to initiate their explosive behavior.

Understanding this distinction is vital for safety protocols, as it highlights the need for caution even with substances that don't exhibit obvious dangerous characteristics in everyday handling. This label also aids in risk assessment during storage, transportation, and response to incidents involving these materials, ensuring that emergency responders are adequately prepared for potential hazards.