Carbon dioxide is a compressed gas agent that prevents combustion by displacing the oxygen in the air surrounding the fire. The two types of dry chemical extinguishers include one that contains ordinary sodium potassium bicarbonate, urea potassium bicarbonate, and potassium chloride base agents.

Calcium carbonate, although much less reactive, is also not used for the same reason. Carbonates which are poisonous, such as barium, lead and the like, are not suitable. The carbonates of cobalt, chromium, cadmium and bismuth may be used but they are relatively expensive.

Generate CO. Sodium bicarbonate is used in most dry fire extinguishers. When dispensed, the products absorb heat, decompose to form fire smothering carbon dioxide, and release free radicals which interrupt the flame chain reaction mechanism. Class B: Fires in flammable liquids.

So, Sodium hydrogen carbonate acts as a fire extinguisher is true and the option is (A). Note: The important chemical property of sodium hydrogen carbonate is being a basic compound, upon reaction with acid undergoes neutralization reaction to give salt and water along with carbon dioxide gas.

Sodium bicarbonate

Where to Find the Model & Serial Number on Fire Extinguishers. The model number will be located on the label in the bottom right or left hand corner.

The life expectancy of our fire extinguishers is approximately 10-12 years after the date of manufacture. The manufacture date is on the UL nameplate on the fire extinguisher canister.

The extinguishers should be placed in areas that are accessible within seconds. Place them in easy-to-grab spots, near exits. The National Fire Protection Association recommends having at least one fire extinguisher on every floor of the home. The first location should be the kitchen.