Answer any seven questions of the following
Discuss van Arkel Boer method for ultrapurification of zirconium.

Explanation

var Arkel Method for Ultra Purification of Zironium (Zr). The crude metal (Zr) is heated in evacuated vessel with iodine at about 870 K. Volatile `Zrl_4`, thus formed is passed through electrical arrangment at about 1800K, which decomposes `Zrl_4` and give pure Zr.
(Tungsten filament)
`underset"(Impure)"(Zr(s))+2l_2(g)overset"870 K"rarrZrl_4(g)overset"1800 K (Tungsten filament)"rarrunderset"(Pure)"(Zr(s))+2l_2(g)`