Class 5 hazards are primarily associated with which substances and outcomes?

Class 5 hazards are primarily associated with which substances and outcomes?

• A. Toxic gases and corrosives.
• B. Flammable liquids and solids.
• C. Oxidizers and organic peroxides, with major hazard of combustion or intense fire.
• D. Cryogenic fluids.

Answer: (C)

Class 5 covers oxidizers and organic peroxides. Oxidizers release or supply oxygen, which fuels and accelerates combustion, while organic peroxides can decompose violently and generate heat and gases. Together, these properties create a major hazard of intense fire or rapid, self-sustaining burning. That focus on how these materials drive fires is why the big risk is combustion or an extremely vigorous fire. The other options describe hazards from different classes: toxic gases and corrosives are associated with other hazard classes (gas and corrosives), flammable liquids and solids belong to Class 3 and 4, and cryogenic fluids pose extreme cold and pressure-related risks rather than the oxidizer-driven fire hazard characteristic of Class 5.

Class 5 covers oxidizers and organic peroxides. Oxidizers release or supply oxygen, which fuels and accelerates combustion, while organic peroxides can decompose violently and generate heat and gases. Together, these properties create a major hazard of intense fire or rapid, self-sustaining burning. That focus on how these materials drive fires is why the big risk is combustion or an extremely vigorous fire.

The other options describe hazards from different classes: toxic gases and corrosives are associated with other hazard classes (gas and corrosives), flammable liquids and solids belong to Class 3 and 4, and cryogenic fluids pose extreme cold and pressure-related risks rather than the oxidizer-driven fire hazard characteristic of Class 5.