Fire extinguishers contain

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(B) Soda-acid fire extinguishers contain a solution of sodium hydrogen carbonate $(NaHCO_3)$ and sulphuric acid $(H_2SO_4)$. When the extinguisher is

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$H_2SO_4$ and $NaHCO_3$ solutions

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(B) Soda-acid fire extinguishers contain a solution of sodium hydrogen carbonate $(NaHCO_3)$ and sulphuric acid $(H_2SO_4)$. When the extinguisher is inverted,these two solutions come into contact and react to produce carbon dioxide gas $(CO_2)$. The reaction is: $2NaHCO_3 + H_2SO_4 \rightarrow Na_2SO_4 + 2H_2O + 2CO_2$. The released $CO_2$ gas helps in extinguishing the fire.

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