Which of the following metals is extracted using the cupellation process?

Zone refining is used for the purification of

In electrorefining of metals,the anode and cathode are taken as a thick slab of impure metal and a strip of pure metal,respectively,while the electrolyte is a solution of a complex metal salt. This method cannot be applied for the refining of:

The metal for which its property of formation of a volatile complex is taken into account for its extraction is:

$Si$ and $Ge$ used for semiconductors are required to be of high purity and hence purified by:

The method,which is based on the principle that "different components of a mixture are differently adsorbed on an adsorbent" is called