Answer:
Soda-acid fire extinguisher contains sodium
bicarbonate and sulphuric acid, which are in separate containers in them. When
knob of the fire extinguisher is pressed, then sulphuric acid mixes with sodium
bicarbonate solution and produces a lot of CO2 gas, which forms a
blanket over the fire and cuts it off from the supply of the air to the burning
substance and the fir stops.
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