Silica is reacted with sodium carbonate . What is the gas liberated ?

Options

A. ` CO`
B. `O_2`
C. `CO_2`
D. `O_3`

Explanation

To determine the gas liberated when silica (SiO2) reacts with sodium carbonate (Na2CO3), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are silica (SiO2) and sodium carbonate (Na2CO3).

2. **Write the Chemical Reaction**:
- The reaction between silica and sodium carbonate can be represented as:
\[ \text{SiO}_2 + \text{Na}_2\text{CO}_3 \rightarrow \text{Na}_2\text{SiO}_3 + \text{CO}_2 \]
- In this reaction, sodium silicate (Na2SiO3) is formed along with carbon dioxide (CO2).

3. **Identify the Products**:
- From the balanced chemical equation, we can see that one of the products is carbon dioxide (CO2).

4. **Conclusion**:
- Therefore, the gas liberated during the reaction is carbon dioxide (CO2).

### Final Answer:
The gas liberated when silica is reacted with sodium carbonate is **carbon dioxide (CO2)**.

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