(B) Iodine is heated with zirconium to form a volatile compound which on further heating decomposes to give pure zirconium. This process is known as t

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(B) Iodine is heated with zirconium to form a volatile compound which on further heating decomposes to give pure zirconium. This process is known as the Van Arkel method for refining metals.Formation: $Zr + 2 I_2 \longrightarrow ZrI_4$ $(300-500^{\circ} C)$Decomposition: $ZrI_4 \longrightarrow Zr + 2 I_2$ $(1100^{\circ} C)$