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Van Arkel method of purification of meta...

Van Arkel method of purification of metals involves converting the metal to a

A

volatile stable compound

B

non-volatile stable compound

C

volatile unstable compound

D

non-volatile unstable compound

Text Solution

Verified by Experts

The correct Answer is:
A
In van Arkel method, the crude metal (to be purified) is heated in an evacuated vessel with iodine at 870 K to form a volatile tetraiodide complex. This complex can be then decomposed by heating over tungsten filament to give pure metal. The complex formed should be a volatile stable compound. For example,
`underset("Crude")(Zr) + 2I_(2) rarr underset("Volatile")(ZrI_4) overset("Tungsten")overset("filament")rarr underset("Pure")(Zr) + 2I_2`
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