In soda-acid extinguisher, the bottle contains:

H_{2} S O_{4}

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N a H C O_{3}

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N a O H

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H C l

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Solution

The correct option is B $H_{2} S O_{4}$
In a soda acid fire extinguisher, concentrated sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide, sodium sulfate and water.
$2 N a H C O_{3} + H_{2} S O_{4} \Rightarrow 2 C O_{2} + N a_{2} S O_{4} + 2 H_{2} O$

Thus Option A is correct.

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