Certified Safety Professional Practice Exam

UN HCS Class 5 specifically refers to oxidizers and organic peroxides. Oxidizers are substances that can cause or enhance the combustion of other materials, as they release oxygen or other oxidizing substances when they degrade or burn. This class is crucial in handling and transportation because oxidizers can significantly increase the risk of fire and explosion when in contact with combustible materials.

Combustible liquids (first choice) fall under a different classification related to their flash points and fire hazards, not as oxidizers. Infectious substances (third choice) are categorized in a separate classification that pertains to biological hazards, while explosives (fourth choice) have their own distinct classification based on their potential to explode or produce a hazard during transport. Understanding these classifications is vital for ensuring safe handling and storage, particularly for hazardous materials.