Dangerous Goods Practice Test

Class 2 is the correct answer because it specifically encompasses gases, which are further divided into three divisions: flammable gases, non-flammable gases, and toxic gases. This classification emphasizes the unique hazards associated with gases, such as the risks of explosion, suffocation, or toxicity when they are released into the environment.

In contrast, Class 1 includes explosives and is entirely focused on materials that can cause explosions, while Class 3 pertains to flammable liquids, and Class 4 covers flammable solids, spontaneously combustible materials, and dangerous when wet substances. These classes address different types of hazards associated with various materials, highlighting the specific risks and safety measures necessary for handling them.