Question:
Which of the following metals is refined by using a tungsten filament for heating in a vessel so that the pure metal deposits on the filament?
Which of the following metals is refined by using a tungsten filament for heating in a vessel so that the pure metal deposits on the filament?
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The iodide (Van Arkel) process is used for ultra-purification of metals like zirconium and titanium.
Updated On: Feb 11, 2026
- Cu
- Zr
- Al
- Ni
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The Correct Option is B
Solution and Explanation
Step 1: Identify the refining method described.
The process described is the Van Arkel–de Boer (iodide) process.
In this method, an impure metal is converted into a volatile iodide and then decomposed on a hot tungsten filament to obtain pure metal.
Step 2: Recall metals purified by iodide process.
This method is used for refining metals like \(\mathrm{Zr}\) and \(\mathrm{Ti}\).
The metal iodide decomposes on the hot tungsten filament, depositing pure metal.
Step 3: Analyze the given options.
(A) Cu: Refined by electrolytic refining.
(B) Zr: Correct — refined by iodide process using tungsten filament.
(C) Al: Extracted by Hall–Héroult process.
(D) Ni: Refined by Mond process.
Step 4: Conclusion.
Zirconium is refined using a tungsten filament in the iodide process.
The process described is the Van Arkel–de Boer (iodide) process.
In this method, an impure metal is converted into a volatile iodide and then decomposed on a hot tungsten filament to obtain pure metal.
Step 2: Recall metals purified by iodide process.
This method is used for refining metals like \(\mathrm{Zr}\) and \(\mathrm{Ti}\).
The metal iodide decomposes on the hot tungsten filament, depositing pure metal.
Step 3: Analyze the given options.
(A) Cu: Refined by electrolytic refining.
(B) Zr: Correct — refined by iodide process using tungsten filament.
(C) Al: Extracted by Hall–Héroult process.
(D) Ni: Refined by Mond process.
Step 4: Conclusion.
Zirconium is refined using a tungsten filament in the iodide process.
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