The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is

Given below are two statements.

Statement $I:$ During electrolytic refining, blister copper deposits precious metals

Statement $II:$ In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the most appropriate answer from the options given below.

Which of the following pair of ores can not be converted into corresponding metals by pyrometallurgy ?

Blister copper is

Among the following an example of thermite process is