Which method of purification is represented by the following equation $\mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g}) \xrightarrow{523 \mathrm{~K}} \mathrm{TiI}_{4}(\mathrm{~g}) \xrightarrow{1700 \mathrm{~K}} \mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g})$

JEE Main · 2012 · 29 Apr 2012 · Offline · General Principles and Processes of Isolation of Metals

Which method of purification is represented by the following equation

Ti (s) + 2 I_{2} (g) 523 K TiI_{4} (g) 1700 K Ti (s) + 2 I_{2} (g)

(A)zone refining
(B)cupellation
(C)Poling
(D)Van Arkel✓ Correct

Answer: (D)

Solution

The equation shows the metal first joining with iodine at a moderate

523

K to make a volatile iodide, and then, at a much hotter

1700

K, that iodide decomposing back to pure metal with the iodine set free to be used again. This cycle of forming and then thermally decomposing a volatile iodide on a hot filament is the Van Arkel (iodide) method, used to refine metals such as titanium and zirconium.

JEE Main · 2012 · 29 Apr 2012 · Offline · Single correct option

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JEE Main · 2012 · 29 Apr 2012 · Offline · General Principles and Processes of Isolation of Metals

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