The anode mud obtained during electro refining of Cu contains:

Options

A. Ag
B. Fe
C. Au
D. Zn

Answer

To answer the question regarding the composition of anode mud obtained during the electro refining of copper, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Electro Refining of Copper**:
- Electro refining is a process used to purify metals, in this case, copper. It involves an electrolytic cell where impure copper (anode) is oxidized and pure copper is deposited at the cathode.

2. **Setup of the Electrolytic Cell**:
- In the electrolytic cell, the anode is made of impure copper, while the cathode is a pure copper rod. The electrolyte used is typically a solution of copper(II) sulfate (CuSO4) mixed with sulfuric acid (H2SO4).

3. **Electrochemical Reactions**:
- When electric current is passed through the cell, copper ions (Cu²⁺) from the anode dissolve into the solution, while pure copper is deposited on the cathode. The anode gradually becomes thinner as copper is oxidized.

4. **Impurities in Anode Mud**:
- The anode mud is composed of impurities that do not dissolve in the electrolyte. These impurities include metals that are less reactive than copper, such as silver (Ag), gold (Au), and platinum (Pt).

5. **Final Composition of Anode Mud**:
- As a result, the anode mud contains valuable metals like silver, gold, and platinum, which can be collected and extracted later.

### Conclusion:
The anode mud obtained during the electro refining of copper primarily contains silver, gold, and platinum.

### Answer:
The anode mud obtained during the electro refining of copper contains silver and gold.

---