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(B) The $Van-Arkel$ method is used for refining metals like $Zr$ and $Ti$. In this process,the crude metal is heated in an evacuated vessel with iodin

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a volatile stable compound

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(B) The $Van-Arkel$ method is used for refining metals like $Zr$ and $Ti$. In this process,the crude metal is heated in an evacuated vessel with iodine to form a volatile metal iodide. For example,$Zr + 2I_2 \rightarrow ZrI_4$. This volatile metal iodide is then decomposed on a tungsten filament at a higher temperature to obtain pure metal. Thus,the metal is converted into a volatile stable compound.

During the purification of metals by the $Van-Arkel$ method,the metal is converted into $......$.

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