Question

select the best choice for the following statement.
multi - purpose or dry chemical extinguishers:
a) use nitrogen to dispel fire - retardant powder
b) halts interactions between fuel and carbon dioxide
c) are filled with water
d) required in kitchens

Explanation:

Multi - purpose or dry chemical extinguishers work by using nitrogen (or in some cases, compressed air) to expel the fire - retardant powder. This powder coats the fuel and interrupts the chemical reaction of fire.
Option b is incorrect because dry chemical extinguishers halt the interaction between fuel, heat, and oxygen (not carbon dioxide). Option c is wrong as they are not filled with water. Option d is not a general characteristic as different types of extinguishers may be required in kitchens depending on the type of fire risk (e.g., wet chemical extinguishers are often preferred for kitchen grease fires).

Answer:

A. Use nitrogen to dispel fire - retardant powder