Gases can be further classified into which categories?

• A. Under pressure
• B. Flammable, non-flammable, poisonous, or corrosive
• C. Gaseous, liquid, solid
• D. Toxic, reactive, inert, stable

Answer: (B)

Gases are categorized by the hazards they pose, which guides how you store, handle, and respond to releases. The main categories you use are flammable gases (ignite or explode), non-flammable gases (not easily ignited but may create other risks), poisonous or toxic gases (harmful to health if inhaled or contacted), and corrosive gases (can damage skin, eyes, lungs, or materials). This way of thinking directly informs safety actions, personal protective equipment, ventilation needs, leak response, and evacuation priorities.

Under pressure describes how a gas is stored rather than its hazard type, so it doesn’t convey how to respond. Gaseous, liquid, solid are states of matter, not hazard classifications for gases. Toxic, reactive, inert, stable describe some properties but don’t capture the full range of immediate safety concerns like flammability or corrosion that are critical in emergency planning.