Electrolyte solution in electrolytic refining of lead contains :

Options

A. `H_(2)SiF_(6)` only
B. `PbSiF_(6)` only
C. `H_(2)SiF_(6)` in presence of gelatin
D. `H_(2)SiF_(6) and PbSiF_(6)` in presence of gelatin

Answer

To determine the electrolyte solution used in the electrolytic refining of lead, we need to analyze the options provided and understand the components involved in the process.

### Step-by-Step Solution:

1. **Understanding Electrolytic Refining**:
- Electrolytic refining is a method used to purify metals. In the case of lead, it involves the use of an electrolyte solution that facilitates the transfer of ions during the electrolysis process.

2. **Identifying the Electrolyte Components**:
- The two main compounds used in the electrolyte solution for lead refining are Lead Fluorosilicate (PbSiF6) and Hexafluorosilicic Acid (H2SiF6).

3. **Analyzing the Options**:
- **Option 1**: H2SiF6
- **Option 2**: PbSiF6
- **Option 3**: H2SiF6 in presence of guillotine
- **Option 4**: H2SiF6 and PbSiF6 in presence of gelatin

4. **Correct Option**:
- The correct choice is **Option 4**: H2SiF6 and PbSiF6 in presence of gelatin. This combination is effective because:
- H2SiF6 provides the necessary fluoride ions, which help in the dissolution of lead.
- PbSiF6 acts as a source of lead ions.
- The presence of gelatin helps to stabilize the solution and improve the quality of the deposited lead.

5. **Temperature of Operation**:
- The process typically operates at a temperature of around 45 degrees Celsius (113 degrees Fahrenheit), which is optimal for the electrolysis to occur efficiently.

6. **Electrode Materials**:
- In this process, thin sheets of pure lead are used as cathodes, while the anodes are made from impure lead that is to be purified.

### Final Answer:
The electrolyte solution in electrolytic refining of lead contains **H2SiF6 and PbSiF6 in presence of gelatin**.

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