Which of the following process is used based on the ability of metal being converted into into volatile compound ?

Options

A. Hydraulic washing
B. Forth flotation
C. Vapour phase refining
D. Electrolytic refining

Answer

To solve the question "Which of the following processes is used based on the ability of metal being converted into a volatile compound?", we will analyze each option provided and determine which one fits the criteria.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for a process that involves the conversion of a metal into a volatile compound. A volatile compound is one that can easily vaporize.

2. **Analyzing Option 1: Hydraulic Washing**:
- Hydraulic washing is a method of gravity separation. It separates ore from impurities based on their density.
- **Conclusion**: This method does not involve the conversion of metals into volatile compounds. **Not the correct option**.

3. **Analyzing Option 2: Flotation**:
- Flotation is a process that separates hydrophobic materials from hydrophilic ones, commonly used for the purification of sulfide ores.
- **Conclusion**: This method does not involve the conversion of metals into volatile compounds. **Not the correct option**.

4. **Analyzing Option 3: Vapor Phase Refining**:
- Vapor phase refining, also known as the Monazite method, involves the thermal decomposition of metal compounds.
- For example, titanium can be converted into a volatile compound like titanium tetraiodide (TiI4), which is then heated to produce pure titanium.
- **Conclusion**: This method specifically involves the conversion of metals into volatile compounds. **This is the correct option**.

5. **Analyzing Option 4: Electrolytic Refining**:
- Electrolytic refining involves the use of an electrolytic cell to purify metals, where the metal is deposited at the cathode from an electrolyte solution.
- **Conclusion**: This process does not involve the conversion of metals into volatile compounds. **Not the correct option**.

### Final Answer:
The correct process that is based on the ability of metal being converted into a volatile compound is **Vapor Phase Refining**.

---