Question
Which method of purification is represented by the following equation
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zone refining
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cupellation
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Polling
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Van-Arkel
Solution
D.
Van-Arkel
Van-Arkel (and de-Boiser) process is based on the thermal decomposition of a volatile compound like an iodide, which is first formed by direct combination of metal to be purified and iodine.
The metallic iodide is then decomposed when heated at a higher temperature and thus the metal obtained in the purest form. Titanium and zirconium are purified by this method.
