Aluminium metal is purified by

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

In the electrolytic refining of an impure metal,a rod of impure metal is used as the anode and a rod of pure metal is used as the cathode,and the aqueous solution of its salt is electrolyzed. Which of the following metals cannot be refined by this method?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

The Van Arkel method for the purification of metals involves converting the metal into a:

Purification of aluminium done by electrolytic refining is known as