In the preparation of sodium carbonate `(Na_(2)CO_(3))` which of the following is used as raw material?

Options

A. Slaked lime
B. Brine
C. Quick lime
D. Sodium hydroxide

Answer

To determine the raw material used in the preparation of sodium carbonate (Na₂CO₃), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Process**: Sodium carbonate is commonly prepared using the Solvay process. This process involves specific raw materials.

2. **List the Options**: The options provided are:
- 1st: Slaked lime
- 2nd: Brine
- 3rd: Quake lime
- 4th: Sodium hydroxide

3. **Understand the Role of Each Option**:
- **Slaked Lime (Calcium Hydroxide)**: This is not directly used in the Solvay process for sodium carbonate production.
- **Brine (Sodium Chloride Solution)**: This is a key raw material in the Solvay process as it provides sodium chloride (NaCl).
- **Quake Lime**: This is not a standard term in chemistry and likely refers to quicklime, which is also not used directly in the Solvay process.
- **Sodium Hydroxide**: While sodium hydroxide can be produced from sodium carbonate, it is not a raw material in the Solvay process.

4. **Conclude the Correct Option**: Since brine is used as a source of sodium chloride (NaCl), which is essential for the production of sodium carbonate in the Solvay process, the correct answer is:
- **Brine (Option 2)**.

### Final Answer:
The raw material used in the preparation of sodium carbonate (Na₂CO₃) is **Brine**.

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