Which is not the correct process mineral matching in metallurgical extraction?

Lead is purified by Electro-refining. Zone.refining is used for the purification of Si and Ge. 

Silver and gold are extracted by leaching the metal with ${\mathrm{CN}}^{-}$.
When exceptionally pure metals are required for a specific use, the zone-refining method is performed. For instance, semiconductors employ pure Si and Ge.
The purification of $\mathrm{Sn}$ and $\mathrm{Zn}$, as well as the removal of Pb from $\mathrm{Zn}-\mathrm{Ag}$ alloy, involves the employment of the liquidation process. The metal itself is readily fusionable, but its impurities are not.

It is possible to refine titanium or zirconium using the Van Arkel process. This process involves heating metal in an evacuated vessel with iodine to eliminate oxygen and nitrogen that are present as impurities. When heated to roughly 1800K, the metal iodide becomes volatile and disintegrates on a tungsten filament. On the filament, the pure metal is deposited.

Therefore, (b) option is correct.