The number of correctly matched pairs are :

(a) Van Arkel method - Zirconium

(b) Mond's process -Titanium

(c) Froth floatation method - Cerussite

(d) Distillation method - Zinc

(e) Poling process - Copper

(f) Amalgamation - Gold

It is possible to refine titanium or zirconium using the Van Arkel process. By heating metal in an evacuated vessel with iodine, oxygen and nitrogen that are present as impurities are eliminated in this process.
Zinc is purified either electrolytically or through reduced pressure distillation. For metals with low boiling points, like zinc and mercury, distillation is highly helpful. To produce the pure metal as distillate, the impure metal is evaporated.
a metallurgical process used to purify tin, which contains, as well as copper, both of which have copper oxide as an impurity.
Finely ground refined gold reacts fast and easily with mercury when the surfaces of both metals are pure, forming alloys ranging from ${\mathrm{AuHg}}_2$ to ${\mathrm{Au}}_8\mathrm{Hg}$.

(i), (iv), (v), (vi)