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Which method of purification is represen...

Which method of purification is represented by the equations. ` Ti(s)+2I_(2)(g)overset(523K)(to) TiI_(4)(g)overset(1700K)(to)Ti(s)+2I_(2)(g)` : Cupellation, Poling, van Arkel, Zone refining

A

Zone refining

B

Cupellation

C

Poling

D

van Arkel

Text Solution

Verified by Experts

The correct Answer is:
D
Ti, Zr, Hfmetals are purified by van Arkel method. In this process, crude Ti is heated with `l_2` first K in an evacuated vessel. It forms `TiI_4` which is a volatile compound and gets decomposed to Ti on heating over tungsten filament at 1700K.
`Ti(s)+2I_2 (g) overset("523K")(rarr)TiI_4(g) overset("1700K")(rarr)Ti(s)+2I_2 (g)`
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