Which of the following pairs of metals uis purified by van arkel method?

Options

A. `Ni and Fe`
B. `Ca and In`
C. `Zr and Ti`
D. `Ag and Au`

Answer

c

Explanation

Small amount very pure metal can be produced when by the van Arkel- deboer metod impure `Zx or Ti` is heated at an evacuated wessel with `I_(2).ZrI_(4) or TiI_(4)` is formed and volatilizes (thus swepar ating it from any impurities )` at atmospheric pressure `ZrI_(4)` melts at `499^(@)C` and boild at `600^(@)C , Ti_(4)` melts at `150^(@)C 377^(@)C ` .However,under reduced presure `the bolding point are lower.
The gasion`MI_(2)` is decompound on a while but magson filement as more metal in depemds on the filatine it conductor electricity heter .This more electriic current must be present to loop a while but
`underset("Impure")(Ti) + 2I_(2) to TiI_(4) overset("tungsten filament")(to) Ti + 2I_(2)`
Zr is produced an a smaller scals than `Ti` `Zr` is non more cartain resistence than is Ti and is steel is chemical plants