What does a soda-acid type fire extinguisher contain? How does it work? Explain the working of a soda-acid fire extinguisher with the help of a labeled diagram.

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Solution

Working:
A soda-acid type of fire extinguisher contains a solution of sodium hydrogen carbonate and sulphuric acid in separate containers inside them. When the knob of the fire extinguisher is pressed, then sulphuric acid mixes with sodium hydrogen carbonate solution to produce carbon dioxide gas which forms a blanket around the burning substance and cuts off the supply of air to the burning substance. This stops the process of burning and fire gets extinguished.

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