A white solid $X$ reacts with dil. $H C l$ to give colourless gas which is used in fire extinguishers. The solid $X$ is:

N a C l

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C H_{3} C O O N a

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N a_{2} C O_{3}

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N a H C O_{3}

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Solution

The correct option is D $N a H C O_{3}$
Sodium bicarbonate can be used for fire extinguishers purpose as it releases carbon dioxide.
The following reaction takes place:

$N a H C O_{3} (X) + H C l \to N a C l + C O_{2} + H_{2} O$

Hence the correct option is $D$ .

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