Which of the following gas extinguishes the fire in soda-acid fire extinguishers:

$O_{2}$

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$C O$

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$C O_{2}$

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$H_{2}$

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Solution

The correct option is C
$C O_{2}$

In soda-acid fire extinguishers, sodium carbonate and sulphuric acid react to form sodium sulphate, carbon dioxide, and water. Carbon dioxide spreads over the fire and cuts off the supply of oxygen and hence fire is extinguished.

$2 N a H C O_{3} (a q) + H_{2} S O_{4} (a q) \to N a_{2} S O_{4} (a q) + 2 H_{2} O (l) + 2 C O_{2} (g)$

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