Poling is employed in the refining of:

The cupellation process is used in the metallurgy of:

How are metals used as semiconductors refined? What is the principle of the method used for $Ge$,$Si$,etc.?

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

Which of the following elements is purified by vapour phase refining?

Write the chemical equations for the $Van$ $Arkel$ method used for the refining of $Zr$ and $Ti$.