In the electroefining of metals, impure metal is

Options

A. Cathode and oxidation takes place
B. Anode and oxidation takes place
C. Anode and reduction takes place
D. Cathode and reduction takes place

Answer

To solve the question regarding the electrorefining of metals, we will analyze the process step by step.

### Step-by-Step Solution:

1. **Understanding Electrorefining**:
Electrorefining is a process used to purify metals. It involves the use of electrolysis to separate impurities from the desired metal.

2. **Identifying Electrodes**:
In electrorefining, there are two electrodes: the anode and the cathode. The anode is where oxidation occurs, and the cathode is where reduction takes place.

3. **Placement of Impure Metal**:
In the electrorefining process, the impure metal (for example, impure copper) is placed at the anode. This is because the anode is where the metal will oxidize and release metal ions into the solution.

4. **Oxidation at the Anode**:
At the anode, the impure metal undergoes oxidation. For copper, the reaction can be represented as:
\[ \text{Cu (s)} \rightarrow \text{Cu}^{2+} (aq) + 2e^- \]
This means that solid copper from the impure metal loses electrons and forms copper ions.

5. **Reduction at the Cathode**:
At the cathode, the copper ions in the solution are reduced to form pure copper. The reduction reaction can be represented as:
\[ \text{Cu}^{2+} (aq) + 2e^- \rightarrow \text{Cu (s)} \]
Here, copper ions gain electrons to become solid copper.

6. **Conclusion**:
Therefore, in the electrorefining process, the impure metal is located at the anode, and oxidation occurs there. The correct answer to the question is that the impure metal is at the anode and oxidation takes place.

### Final Answer:
The impure metal is at the **anode** and **oxidation** takes place.

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