In the vapour phase refining methods, Mond's process and the Van Arkel method rely on specific volat — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

In Mond's process, $Ni$ forms volatile $Ni(CO)_4$ at $330-350 K$ and decomposes at $450-470 K$. In the Van Arkel method, $Ti$ or $Zr$ forms volatile iodides ($TiI_4$, $ZrI_4$) which are decomposed on a tungsten filament at highly elevated temperatures ($1800 K - 2070 K$) to deposit pure metal.