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Question

CO2 gas along with solid (Y) is obtained when sodium salt (X) is heated. (X) is again obtained when CO2 gas is passed into aqueous solution of (Y). Identify (X) and (Y) respectively.

A
Na2CO3,Na2O
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B
Na2CO3,NaOH
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C
NaHCO3,Na2CO3
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D
Na2CO3,NaHCO3
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Solution

The correct option is C NaHCO3,Na2CO3

2NaHCO3(s) = Na2CO3(s) + CO2(g) + H2O(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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