Consider the given chemical equation and identify X.

$2 {NaHCO}_{3} Heat - - \to {Na}_{2} {CO}_{3} + H_{2} O + X$

O_{2}

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C O_{2}

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H_{2}

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Solution

The correct option is B $C O_{2}$
Baking soda i.e. sodium hydrogen carbonate $(N a H C O_{3})$ is added for faster cooking. The following reaction takes place when it is heated during cooking.

$2 {NaHCO}_{3} (Sodium hydrogen carbonate) Heat - - \to {Na}_{2} {CO}_{3} (Sodium carbonate) + H_{2} O (Water) + {CO}_{2} (Carbon dioxide gas) ↑ ⏐ ⏐ ⏐ ⏐$

So, gas ‘X’ is carbon dioxide, $C O_{2}$ .

Hence, the correct answer is option (b).

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