Mond's process is used for refining of

Options

A. Ni
B. Ag
C. Sn
D. Al

Answer

**Step-by-Step Solution:**

1. **Understanding Mond's Process**: Mond's process is a method used for the refining of certain metals, particularly nickel. It involves the formation of a volatile compound of the metal, which can be separated from impurities.

2. **Formation of Nickel Tetracarbonyl**: In this process, impure nickel is reacted with carbon monoxide (CO) at low temperatures to form nickel tetracarbonyl (Ni(CO)₄). The chemical reaction can be represented as:
\[ \text{Ni (impure)} + 4 \text{CO} \rightarrow \text{Ni(CO)}_4 \]
This compound is a gas at room temperature and is volatile.

3. **Decomposition of Nickel Tetracarbonyl**: The nickel tetracarbonyl is then heated to a higher temperature, which causes it to decompose back into pure nickel and carbon monoxide:
\[ \text{Ni(CO)}_4 \xrightarrow{\text{heat}} \text{Ni (pure)} + 4 \text{CO} \]
This step effectively separates the pure nickel from the impurities that remain behind.

4. **Conclusion**: Therefore, Mond's process is specifically used for the refining of nickel.

**Final Answer**: Mond's process is used for refining nickel.

---