The electrolyte, used in Castner's proceed of sodium extraction is

Options

A. anhydrous `Na_(2)CO_(3)`
B. aqueous NaOH
C. `NaCI+CaCI_(2)`
D. fused anhdrous NaOH

Answer

To solve the question regarding the electrolyte used in Castner's process of sodium extraction, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Castner Process**: The Castner process is a method for extracting sodium metal through electrolysis. It involves the electrolysis of a specific electrolyte.

2. **Identifying the Electrolyte**: The electrolyte used in the Castner process is fused sodium hydroxide (NaOH). This means that sodium hydroxide is heated until it becomes a liquid, allowing the ions to move freely.

3. **Electrolysis Reaction**: During the electrolysis of fused NaOH:
- At the **cathode**, sodium ions (Na⁺) gain electrons (reduction) to form sodium metal (Na).
- At the **anode**, hydroxide ions (OH⁻) lose electrons (oxidation) to produce water (H₂O) and oxygen gas (O₂).

4. **Final Confirmation**: The correct electrolyte for the Castner process is indeed fused anhydrous sodium hydroxide (NaOH), as it allows for the necessary ionic movement for the electrolysis to occur effectively.

### Conclusion:
The electrolyte used in Castner's process of sodium extraction is **fused anhydrous NaOH**.

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