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Which of the following pairs of metals are refined by the van Arkel process?

1. Ga and In
2. Zr and Ti
3. Ag and Au
4. Ni and Fe

Correct answer: Zr and Ti

Solution

The van Arkel (iodide) process purifies Zr and Ti by forming volatile ZrI4/TiI4 which decompose on a hot filament to deposit pure metal. Ni is refined by the Mond process and Fe by other routes.

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