Which of the following are used to suppress gasoline and oil fires? Each correct answer represents a complete solution. Choose three.

Question

Options

• AWater
• BCO2
• CHalon
• DSoda acid

• A
  18% (3)
• B
  82% (14)

Explanation

CO2 (B), Halon (C), and Soda acid (D) are all effective at suppressing Class B fires - gasoline and oil - because they work by either displacing oxygen, chemically interrupting the combustion chain, or generating CO2 as a suppression byproduct without spreading the burning liquid. CO2 smothers the fire by starving it of oxygen. Halon chemically disrupts the chain reaction of combustion at the molecular level. Soda acid generates CO2 through its chemical reaction, which can suppress the fire without introducing water.

Water (A) is the critical distractor: applying water to a gasoline or oil fire causes the flammable liquid to scatter and spread, dramatically worsening the fire rather than extinguishing it - making it the most dangerous choice.

Memory tip: Think "No water on grease or gas - it makes a bigger mess." For Class B fires, remember CHemicals and CO2 (CO2, Halon, chemical-reaction agents) are your friends; water is the enemy.

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