When the sample of copper with zinc impurityn is to be purified by electrolysis, the appropriate electrode are .

Options

A. Cathode : Pure `Zn`
Anode : Pure` Cu`
B. Cthode : Impure sample
Anode : Pure `Cu`
C. Cathode : Impure `Zn`
Anode : Impure sample
D. Cathode : Pure `Cu`
Anode : Impure sample

Explanation

To purify a sample of copper with zinc impurity through electrolysis, we need to identify the appropriate electrodes used in the process. Here’s a step-by-step solution:

### Step 1: Understand the Process of Electrolytic Refining
Electrolytic refining is a method used to purify metals, particularly copper. It involves the use of an electric current to drive a chemical reaction that separates the desired metal from impurities.

**Hint:** Remember that electrolytic refining involves two electrodes: an anode and a cathode.

### Step 2: Identify the Electrodes
In the case of copper purification:
- **Anode**: The anode is made of the impure copper sample. This is where oxidation occurs.
- **Cathode**: The cathode is made of pure copper. This is where reduction occurs.

**Hint:** The anode is where the metal dissolves, and the cathode is where it gets deposited.

### Step 3: Understand the Reactions at Each Electrode
At the anode (impure copper):
- The impure copper oxidizes, releasing copper ions (Cu²⁺) into the solution. Impurities, such as zinc, also dissolve into the solution.

At the cathode (pure copper):
- The copper ions (Cu²⁺) from the solution are reduced and deposited as pure copper metal.

**Hint:** Oxidation occurs at the anode and reduction occurs at the cathode.

### Step 4: Conclusion
Thus, the appropriate electrodes for the electrolysis of copper with zinc impurity are:
- **Anode**: Impure copper
- **Cathode**: Pure copper

The correct answer is that the anode is the impure sample and the cathode is pure copper.

**Final Answer:** The appropriate electrodes are:
- Anode: Impure copper
- Cathode: Pure copper