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In the purification of zirconium by Van Arkel process which halogen is used?

1. Flourine
2. Chlorine
3. Bromine
4. lodine

Correct answer: lodine

Solution

In the Van Arkel process, impure zirconium is converted into a volatile tetrahalide and then decomposed on a hot filament to deposit pure metal. The halogen used is iodine because zirconium iodide is sufficiently volatile for this transport step.

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