The cupellation process is used in the metallurgy of:

How many of the following can be purified by using zone refining method?
$Ni, B, Ti, In, Ge, Mn, Ag, Si, Ga$

Boron and silicon of very high purity can be obtained through :

Match the elements in Column-$I$ with methods of purification in Column-$II$.

Column-$I$	Column-$II$
$(a)$ Boron	$(i)$ Van Arkel method
$(b)$ Tin	$(ii)$ Mond's process
$(c)$ Zirconium	$(iii)$ Liquation
$(d)$ Nickel	$(iv)$ Zone refining

Metal $X$ obtained from sphalerite ore can be purified by which of the following methods?

Which process of purification is represented by the following scheme?
$\text{Ti}_{\text{impure}} + 2I_2$ $\xrightarrow{250^{\circ}C} TiI_4$ $\xrightarrow{1400^{\circ}C} \text{Ti}_{\text{pure}} + 2I_2$