In the elctrolysis refinin of copper, Ag and Au are found:

Options

A. on anode
B. in electrolyte solution
C. in anode mud
D. in cathode mud

Answer

### Step-by-Step Solution:

1. **Understanding Electrolytic Refining**:
- Electrolytic refining is a process used to purify metals. In this case, we are focusing on copper refining.
- The process involves the use of an electrolytic cell, where an impure metal (copper) is oxidized at the anode and pure metal is deposited at the cathode.

2. **Components of the Electrolytic Cell**:
- The cell consists of two electrodes: an anode (where oxidation occurs) and a cathode (where reduction occurs).
- The electrolyte used is typically a solution of copper sulfate (CuSO₄).

3. **Reactions at the Electrodes**:
- At the **anode**, the impure copper undergoes oxidation:
\[ \text{Cu (s)} \rightarrow \text{Cu}^{2+} (aq) + 2e^- \]
- This means that copper ions are released into the solution, and the anode loses mass as copper is oxidized.

- At the **cathode**, copper ions from the solution are reduced:
\[ \text{Cu}^{2+} (aq) + 2e^- \rightarrow \text{Cu (s)} \]
- This results in the deposition of pure copper on the cathode.

4. **Formation of Anode Mud**:
- As the impure copper is oxidized at the anode, other metals that are less reactive than copper, such as silver (Ag) and gold (Au), do not dissolve into the solution.
- Instead, they accumulate at the bottom of the electrolytic cell, forming what is known as "anode mud".

5. **Conclusion**:
- In the electrolysis refining of copper, silver and gold are found in the anode mud, which is the residue left at the anode after the process.

### Final Answer:
- In the electrolysis refining of copper, silver and gold are found in **anode mud**.