Separation of silver from lead is done by :

Options

A. filtration
B. addition of zinc
C. amalgamation
D. fractional crystallisation

Explanation

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

### Step 1: Understand the Context
The question asks about the separation of silver from lead. This is a common process in metallurgy, particularly when dealing with argentiferous galena (lead sulfide that contains silver).

**Hint**: Look for historical methods used in metallurgy for separating metals.

### Step 2: Identify the Process
One of the traditional methods for separating silver from lead is known as the Parkes process. This method is specifically designed for the extraction of silver (and gold) from lead ores.

**Hint**: Think about processes that involve chemical reactions and the properties of metals.

### Step 3: Describe the Parkes Process
In the Parkes process, argentiferous galena is first reduced to metallic lead. Once we have molten lead, zinc is added to it. The key point is that silver is much more soluble in zinc than in lead.

**Hint**: Consider the solubility of metals in each other when mixed.

### Step 4: Explain the Separation Mechanism
When zinc is added to molten lead containing silver, the silver preferentially migrates into the zinc. Since zinc is immiscible in lead, it forms a separate layer on the surface. This allows for easy removal of the zinc layer, which contains the dissolved silver.

**Hint**: Focus on the physical properties of the metals involved, such as immiscibility and solubility.

### Step 5: Final Steps of the Process
After the separation, the zinc-silver solution is heated to vaporize the zinc, leaving behind nearly pure silver.

**Hint**: Remember the final steps often involve heating or refining processes to isolate the desired metal.

### Conclusion
Based on the above steps, the correct answer to the question is that the separation of silver from lead is done by the **addition of zinc** (Option 2).

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