Electrolytic refining is used to purify which of the following metals?

Options

A. Cu and Zn
B. Ge and Si
C. Zr and Ti
D. Zn and Hg

Explanation

**Step-by-Step Solution:**

1. **Understanding Electrolytic Refining**: Electrolytic refining is a process used to purify metals. It involves the use of an electrolytic cell where an impure metal is used as the anode and a pure metal is deposited at the cathode.

2. **Identifying the Metals**: The question asks which metals can be purified using electrolytic refining. The common metals that are purified using this method include copper and zinc.

3. **Process Description**:
- In the electrolytic cell, the impure metal (for example, impure copper) is placed at the anode.
- An electrolyte solution containing the metal ions (like copper sulfate for copper) is used.
- The cathode is made of pure metal or a conductive material where the pure metal will deposit.

4. **Oxidation and Reduction Reactions**:
- At the anode, oxidation occurs. The impure metal loses electrons and dissolves into the electrolyte as metal ions. For instance, if copper is used, the reaction is:
\[ \text{Cu (s)} \rightarrow \text{Cu}^{2+} (aq) + 2e^- \]
- At the cathode, reduction occurs. The metal ions from the solution gain electrons and deposit as pure metal. For copper, the reaction is:
\[ \text{Cu}^{2+} (aq) + 2e^- \rightarrow \text{Cu (s)} \]

5. **Result**: As a result of this process, the impure metal at the anode is converted into metal ions, leaving behind impurities (anode mud), while pure metal is deposited at the cathode.

6. **Conclusion**: Therefore, electrolytic refining is primarily used to purify metals such as copper and zinc.

**Final Answer**: Electrolytic refining is used to purify metals like copper and zinc.

---