Question

Van Arkel method of purification of metals involves the conversion of the metal into a ______.

पर्याय

• volatile stable compound

• non-volatile unstable compound

• non-volatile stable compound

• volatile unstable compound

Answer 1

Van Arkel method of purification of metals involves the conversion of the metal into a volatile unstable compound.

Explanation:

In the Van Arkel method of purification, the impure metal is first heated with iodine to form a volatile unstable metal iodide compound (e.g., TiI₄ for titanium). This volatile compound vapour is then decomposed on a heated filament to yield pure metal and iodine. Thus, the method involves converting the metal into a volatile unstable compound which can be decomposed easily to obtain the pure metal. This method is typically used for metals like titanium and zirconium to remove impurities such as oxygen and nitrogen.