Silver can be separated form lead by:

Options

A. fractional crystallisation
B. amalgamation
C. cupellation
D. addition of zinc (Parke's method)

Answer

To solve the question of how silver can be separated from lead, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**: We need to identify the method by which silver can be separated from lead. The options provided are fractional crystallization, amalgamation, cupellation, addition of zinc, and Parkes method.

2. **Analyzing the Methods**:
- **Fractional Crystallization**: This method is used to separate substances based on their different solubilities. It is not suitable for separating silver from lead.
- **Amalgamation**: This involves mixing metals with mercury to form an amalgam. This method is not typically used for separating silver from lead.
- **Cupellation**: This is a refining process in metallurgy where ores or alloyed metals are treated under high temperatures and controlled operations to separate noble metals. However, it is not the direct method for separating silver from lead.
- **Addition of Zinc**: Zinc can be added to liquid lead that contains silver. Zinc is immiscible with lead and has a higher solubility for silver, allowing silver to migrate to the zinc layer.
- **Parkes Method**: This is a specific process that utilizes the addition of zinc to separate silver from lead. It is based on the principle that zinc is more soluble in silver than in lead.

3. **Choosing the Correct Method**: Based on the analysis, the Parkes method (which involves the addition of zinc) is the most effective way to separate silver from lead. In this method, zinc is added to the molten lead, allowing silver to preferentially dissolve in the zinc, which can then be separated.

4. **Conclusion**: The correct answer to the question is that silver can be separated from lead by the **addition of zinc**, specifically through the **Parkes method**.

### Final Answer:
Silver can be separated from lead by the **addition of zinc (Parkes method)**.

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