One of the following metals forms a volatile compound and this property is taken advantages for its extraction. This metal is

Options

A. Iron
B. Nickel
C. Cobalt
D. Tungsten

Answer

To solve the question regarding which metal forms a volatile compound that is advantageous for its extraction, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Metals**: The metals provided in the question are iron, nickel, cobalt, and tungsten.

2. **Research Volatile Compounds**: We need to determine which of these metals forms a volatile compound. A volatile compound is one that can easily vaporize at relatively low temperatures.

3. **Check Each Metal**:
- **Iron**: Iron does not form a volatile compound that is commonly used for extraction.
- **Nickel**: Nickel forms a volatile compound known as nickel carbonyl (Ni(CO)4). This compound is indeed volatile and can be used in extraction processes.
- **Cobalt**: Cobalt does not form a volatile compound that is utilized for extraction.
- **Tungsten**: Tungsten also does not form a volatile compound that is used for extraction.

4. **Extraction Process**: The extraction of nickel using its volatile compound is known as the **Mond Process**. In this process, impure nickel is reacted with carbon monoxide to form nickel carbonyl:
\[ \text{Ni} + 4 \text{CO} \rightarrow \text{Ni(CO)}_4 \]
Upon heating, nickel carbonyl decomposes to yield pure nickel and carbon monoxide:
\[ \text{Ni(CO)}_4 \rightarrow \text{Ni} + 4 \text{CO} \]

5. **Conclusion**: Since nickel is the only metal among the options that forms a volatile compound (nickel carbonyl) and this property is utilized in its extraction, we conclude that the answer is nickel.

### Final Answer:
The metal that forms a volatile compound and whose property is taken advantage of for extraction is **Nickel**.

---