When disposing chemical waste, which practice is essential?

• A. Do not label containers to save time
• B. Dispose in regular trash after trivial disposal
• C. Label containers and segregate by hazard
• D. Mix incompatible wastes to save space

Answer: (C)

Labeling containers and segregating waste by hazard is essential when disposing chemical waste. Clear labels identify exactly what the container holds, its hazards, and when it was placed in storage, which helps anyone handling the waste take the right precautions and route it to the proper hazardous-waste stream. Segregation by hazard means keeping incompatible wastes apart—acids from bases, oxidizers from fuels, organics from inorganics—so a leak or spill doesn’t trigger a dangerous reaction. This approach also aids emergency responders and supports regulatory compliance. The other practices are unsafe or unlawful: not labeling makes contents unknown and dangerous to handle; disposing of chemical waste in regular trash risks environmental contamination and penalties; mixing incompatible wastes can cause fires, explosions, or toxic gas release.