Question

Soda-acid fire extinguisher contains a solution of sodium hydrogen carbonate and ________ .

• A. sulfuric acid
• B. nitric acid
• C. hydrochloric acid
• D. none of the above

Answer 1

The correct option is A sulfuric acid

Soda-acid fire extinguisher contains a solution of sodium hydrogen carbonate and sulfuric acid. The following reaction takes place:
$2NaHC{O}_3+H_{2}S{O}_4\to N{a}_{2}S{O}_4+2H_{2}O+2C{O}_2$
This increases the percentage of carbon dioxide in air. Due to this, the supply of air is cut off and fire is extinguished.