Which class is known for materials that emit oxygen and enhance combustion?

Class 5.1 is designated for oxidizing substances, which are materials that can provide oxygen or enhance the combustion of other materials. These substances can cause or intensify a fire, making them particularly hazardous in the presence of flammable materials. The role of oxidizers is critical in understanding their potential for creating explosive or fiery reactions, as they can react vigorously, leading to an increased fire risk in various situations.

In contrast, the other classes listed pertain to different categories of hazardous materials that do not possess the same properties related to combustion enhancement. For instance, Class 5.2 involves organic peroxides, which are another category of substances but do not specifically refer to materials that enhance combustion in the same way that Class 5.1 does. Class 6.2 addresses infectious substances, while Class 4.1 relates to flammable solids, which, although they can catch fire, do not specifically enhance combustion like oxidizers do. Thus, Class 5.1 is correctly identified as the class that consists of materials known for emitting oxygen and enhancing combustion.