In the metallurgical process for the electro-refining of the metal, the anode is made of ...........metal.

Answer

**Step-by-Step Solution:**

1. **Understanding Electro-Refining**: Electro-refining is a process used to purify metals. In this process, an electrolytic cell is used where an anode and a cathode are involved.

2. **Identifying Anode and Cathode**: In the electro-refining process, the anode is typically made of impure metal, while the cathode is made of pure metal. The impure metal at the anode dissolves into the solution, and pure metal is deposited on the cathode.

3. **Materials Used**: Common metals that undergo electro-refining include copper (Cu), silver (Ag), zinc (Zn), tin (Sn), lead (Pb), aluminum (Al), nickel (Ni), and chromium (Cr).

4. **Conclusion**: Therefore, in the metallurgical process for the electro-refining of the metal, the anode is made of impure metal.

**Final Answer**: The anode is made of impure metal.

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