The Van Arkel method is an essential technique for obtaining ultra-pure Titanium () and Zirconium () — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

The Van Arkel method removes $O_2$ and $N_2$ impurities by forming volatile iodides (like $TiI_4$) at lower temperatures ($\approx 500 K$), which are then decomposed thermally (not electrolytically) on a hot tungsten filament ($\approx 1800 K$) to deposit ultra-pure metal.