Which pair of metals is obtained in ultrapure form by the van Arkel method?

ASodium and potassium
BTitanium and zirconium
CZinc and cadmium
DIron and lead

Answer: B

The van Arkel method needs a metal that forms a volatile iodide, which then decomposes on a hot tungsten filament. Titanium and zirconium form volatile

TiI X_{4}

and

ZrI X_{4}

and are purified this way.

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