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Van Arkel method of refining is used for...

Van Arkel method of refining is used for

A

zorconium

B

silicon

C

germanium

D

titanium

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Van Arkel Method**: The Van Arkel method is a chemical process used for refining certain metals. It is particularly effective for metals that form volatile compounds. 2. **Identifying the Metals**: The question lists zirconium, silicon, germanium, and titanium. We need to determine which of these metals can be refined using the Van Arkel method. 3. **Reactions Involved**: The Van Arkel method involves the reaction of the metal (in this case, zirconium or titanium) with iodine to form a volatile iodide. For zirconium, the reaction can be represented as: \[ \text{Zr} + 2\text{I}_2 \rightarrow \text{ZrI}_4 \] This reaction produces zirconium tetraiodide, which is a volatile compound. 4. **Separation of the Volatile Compound**: Once the volatile iodide is formed, it is separated from the non-volatile impurities. This is done by heating the volatile compound on a tungsten filament. 5. **Decomposition to Pure Metal**: The volatile compound decomposes upon heating, releasing iodine and leaving behind pure zirconium or titanium: \[ \text{ZrI}_4 \rightarrow \text{Zr} + 2\text{I}_2 \] 6. **Conclusion**: The Van Arkel method is specifically used for refining zirconium and titanium, as these metals can form volatile iodides that can be easily separated and purified. ### Final Answer: The Van Arkel method of refining is used for zirconium and titanium.
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