In electrorefining of copper,some gold is deposited as

Options

A. cathode mud
B. electrolyte
C. anode mud
D. cathode

Explanation

To solve the question regarding the electrorefining of copper and the deposition of gold, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Electrorefining**: In the electrorefining process, impure copper is used as the anode, and pure copper is deposited on the cathode. The electrolyte is a solution of copper sulfate.

2. **Anode Reaction**: At the anode, oxidation occurs. The impure copper dissolves into the electrolyte as copper ions (Cu²⁺). The reaction can be represented as:
\[ \text{Cu (s)} \rightarrow \text{Cu}^{2+} (aq) + 2\text{e}^- \]

3. **Cathode Reaction**: At the cathode, reduction takes place. The copper ions from the electrolyte are reduced and deposit as pure copper on the cathode:
\[ \text{Cu}^{2+} (aq) + 2\text{e}^- \rightarrow \text{Cu (s)} \]

4. **Impurities and Anode Mud**: As the impure copper dissolves, any impurities that do not dissolve (such as gold, silver, and other metals) settle at the bottom of the electrolytic cell. This residue is known as "anode mud."

5. **Identifying the Correct Option**: The question asks where gold is deposited during the electrorefining of copper. Since gold is one of the impurities that settles at the bottom of the cell, the correct answer is "anode mud."

### Final Answer:
The correct option is **anode mud**.

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