Which of the following is an example of an oxidizer?

Hydrogen peroxide is classified as an oxidizer due to its chemical properties. Oxidizers are substances that can promote combustion by providing oxygen or another oxidizing environment to a reaction. In the case of hydrogen peroxide, it can release oxygen gas when it decomposes, which can enhance fires or support combustion of other materials. This characteristic is significant in emergency response situations, as it requires specific handling and storage procedures to mitigate the risks associated with its reactivity.

In contrast, the other substances listed, such as acetic acid, sodium hydroxide, and ammonium hydroxide, do not possess the same oxidizing capabilities. Acetic acid is a weak acid, sodium hydroxide is a strong base, and ammonium hydroxide is a solution of ammonia in water, which primarily act through different chemical interactions rather than as oxidizers. Understanding the roles and characteristics of oxidizers like hydrogen peroxide is crucial for safe handling and response in hazardous materials incidents.