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In which of the following is vapour-phase refining carried out?
- Zr
- Al
- Ag
- Zn
Correct answer: Zr
Solution
Vapour phase refining is used for metals that can form volatile compounds easily. Zirconium (Zr) is purified by the van Arkel method: Zr is converted to ZrI4 (volatile) which is then thermally decomposed on a hot tungsten filament to give pure Zr. Aluminium is refined electrolytically. Silver is refined by electrolysis or cupellation. Zinc is refined by liquation or electrolytic refining.
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