The method of electrolytic refining is not suitable in the extraction of

Options

A. Aluminium
B. Copper
C. Mercury
D. Silver

Answer

To determine which metal is not suitable for extraction using the method of electrolytic refining, let's analyze the options provided:

### Step 1: Understand Electrolytic Refining
Electrolytic refining is a process used to purify metals. It is particularly effective for extracting metals that are more reactive. During this process, an impure metal is made the anode, and a pure metal is deposited at the cathode.

### Step 2: Analyze the Options
1. **Aluminium**: This is a highly reactive metal. Electrolytic refining is suitable for aluminium extraction.
2. **Copper**: Copper is also suitable for electrolytic refining as it is a moderately reactive metal.
3. **Mercury**: Mercury is a less reactive metal and is typically extracted using self-reduction methods rather than electrolytic refining.
4. **Silver**: Silver is a precious metal that can be extracted using electrolytic refining.

### Step 3: Conclusion
Based on the analysis, the method of electrolytic refining is not suitable for the extraction of **Mercury**.

### Final Answer
The correct option is **3. Mercury**.

---