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Question

Consider the given chemical equation and identify X.

2NaHCO3HeatNa2CO3+H2O+X

A
O2
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B
CO2
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C
CO
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D
H2
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Solution

The correct option is B CO2
Baking soda i.e. sodium hydrogen carbonate (NaHCO3) is added for faster cooking. The following reaction takes place when it is heated during cooking.

2NaHCO3(Sodium hydrogen carbonate)HeatNa2CO3(Sodium carbonate)+H2O(Water)+CO2(Carbon dioxide gas)⏐ ⏐ ⏐

So, gas ‘X’ is carbon dioxide, CO2.

Hence, the correct answer is option (b).

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