Which inert gas is commonly used in fire-fighting applications for domestic areas?

The correct choice is carbon dioxide, which is widely used as an extinguishing agent in fire-fighting applications, particularly in domestic settings. Carbon dioxide is effective because it displaces oxygen in the air, thereby suffocating the fire and extinguishing the flames without leaving residue or causing damage to sensitive electronic equipment or materials that water might harm. Its non-flammable nature and ability to effectively reduce the oxygen concentration in the vicinity of a fire make it ideal for use in enclosed spaces, such as homes, offices, and laboratories.

Carbon dioxide fire extinguishers are easily identifiable by their distinct black color and are designed for Class B (flammable liquids) and Class C (electrical) fires, making them a versatile and valuable tool in fire prevention and safety measures.