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Question

Which of the following substance can be used to make a fire extinguisher?


  1. Common salt

  2. Bleaching powder

  3. Baking soda

  4. Washing soda


Solution

The correct option is C

Baking soda


A fire-extinguisher generally consists of baking soda and vinegar. The role of a fire extinguisher is to extinguish the fire by releasing carbon-dioxide which does not support combustion. So, the reaction which is the principle behind the working of fire extinguisher is the reaction between an acid and a metal bicarbonate. Acids react with a metal bicarbonate to form a metal salt, carbon-dioxide gas and water.  

Acid(aq)+Metal Bicarbonate(s)Metal Salt(s)+H2O(l)+CO2(g)

The reaction between acetic acid and baking soda is:

 CH3COOH(aq)+NaHCO3(s)CH3COONa(s)+H2O(l)+CO2(g)

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