$C O_{2}$ gas along with solid (Y) is obtained when sodium salt (X) is heated. (X) is again obtained when $C O_{2}$ gas is passed into aqueous solution of (Y). Identify (X) and (Y) respectively.

N a_{2} C O_{3}, N a_{2} O

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N a_{2} C O_{3}, N a O H

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N a H C O_{3}, N a_{2} C O_{3}

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N a_{2} C O_{3}, N a H C O_{3}

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Solution

The correct option is C $N a H C O_{3}, N a_{2} C O_{3}$
$2 N a H C O_{3} (s)$ = $N a_{2} C O_{3} (s)$ + $C O_{2} (g)$ + $H_{2} O (g) .$
Because of this reaction, it is often used in cooking under the name baking soda as it releases CO2 and produces foam as in cakes.
Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃
Sodium carbonate react with carbon dioxide and water to produce sodium bicarbonate.

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