Which of the following is classified as an oxidizer?

• A. Water
• B. Chlorine
• C. Acetone
• D. Helium

Answer: (B)

Chlorine is classified as an oxidizer because it has the ability to release oxygen and promote combustion. Oxidizers can support the combustion of fuels by providing the necessary oxygen for a fire to burn. Chlorine, in its gaseous form, can enhance the flammability of materials and is often used in water treatment and disinfection processes, which highlight its reactive nature. Understanding its role as an oxidizer is crucial in hazardous materials management, particularly in fire safety and emergency response situations, as it can react violently with incompatible substances.

The other substances listed do not act as oxidizers; water is typically considered a non-flammable liquid, acetone is a highly flammable liquid but does not significantly promote combustion of other materials, and helium is an inert gas that does not react or support combustion.