Monoammonium phosphate is used for Class A fires.

Monoammonium phosphate is used for Class A fires.

• A. Class B fires
• B. Class A fires
• C. Class C fires
• D. Class D fires

Answer: (B)

Monoammonium phosphate is a dry chemical extinguishing agent used in multipurpose extinguishers. The key idea is that it works well on ordinary combustibles—like wood, paper, and fabric—by coating the fuel with a fine residue that cools the material and forms a barrier that slows or stops the flame’s chemical reactions. This combination makes it particularly effective for Class A fires, where the fuel is a common combustible material. In practice, this agent is also suitable for other fire types when used in the right extinguisher, but its strong association with ordinary combustibles is why Class A is the best choice for this statement. It is not used for metal fires, so that option would not fit the context.

Monoammonium phosphate is a dry chemical extinguishing agent used in multipurpose extinguishers. The key idea is that it works well on ordinary combustibles—like wood, paper, and fabric—by coating the fuel with a fine residue that cools the material and forms a barrier that slows or stops the flame’s chemical reactions. This combination makes it particularly effective for Class A fires, where the fuel is a common combustible material. In practice, this agent is also suitable for other fire types when used in the right extinguisher, but its strong association with ordinary combustibles is why Class A is the best choice for this statement. It is not used for metal fires, so that option would not fit the context.