Copper containing zinc as impurity is refined by electrolysis. The cathode and anode used are

Options

A. `{:(Cathode,,,Anode),( Pure copper, , ,Pure zi nc):}`
B. `{:(Cathode,,,Anode),(Pure zi n c, , ,Pure copper):}`
C. `{:(Cathode,,,Anode),(Pure copper, , ,Impure copper):}`
D. `{:(Cathode,,,Anode),(Pure zi nc, , ,Impure zi nc):}`

Explanation

To solve the question regarding the refining of copper containing zinc as an impurity through electrolysis, we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Understanding Electrolysis**:
Electrolysis is a process that uses electrical energy to drive a non-spontaneous chemical reaction. In the case of refining metals, it is used to purify metals from their ores or from mixtures.

2. **Identifying the Electrolytic Cell Components**:
In an electrolytic cell, there are two electrodes: the anode and the cathode. The anode is where oxidation occurs, and the cathode is where reduction takes place.

3. **Determining the Anode**:
Since we are refining copper that contains zinc as an impurity, the anode must be made of impure copper. This is because during electrolysis, the impure copper will oxidize and dissolve into the electrolyte, releasing copper ions into the solution. The impurities, including zinc, will not dissolve and will settle at the bottom of the electrolytic cell as anode mud.

4. **Determining the Cathode**:
The cathode, on the other hand, is where pure copper is deposited. As copper ions from the electrolyte are reduced, they gain electrons and deposit onto the cathode, forming pure copper.

5. **Conclusion**:
Therefore, in this electrolysis process, the anode is made of impure copper, and the cathode is made of pure copper. This matches option number three from the given choices.

### Final Answer:
- **The cathode is pure copper, and the anode is impure copper.**

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