Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

Explanation

### Step-by-Step Solution:

1. **Understanding Electrolytic Refining**:
- Electrolytic refining is a method used to purify metals through the process of electrolysis. In this process, an electric current is passed through an electrolytic solution containing metal ions.

2. **Components of the Electrolytic Cell**:
- The electrolytic cell consists of two electrodes: the anode (positive electrode) and the cathode (negative electrode).
- In the case of copper refining, the cathode is made of pure copper, while the anode is made of impure copper.
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