Refining methods that depend on conversion of the metal into a volatile compound followed by its decomposition are

Avan Arkel method (Zr)
BMond process (Ni)
CZone refining of Ge
DLiquation of tin

Answer: A, B

Mond (via

Ni (CO) X_{4}

) and van Arkel (via

ZrI X_{4}

) form a volatile compound and decompose it to the pure metal. Zone refining relies on solubility difference and liquation on a melting-point difference.

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