The anodes are of impure metal and pure metal are taken as cathode. The technique used here is 

Benefaction is otherwise called

The naturally occuring chemical substances in the earth's crust obtainable by mining are called

The technique  very useful in the refining of low melting metal like tin is

The extraction of gold and Ag involves leaching the metal with

In the electrolytic cell for the extraction of Al, the gases formed in anode are

Heating of ores are called

Most abundant metal is

Which scrap is more suitable for reducing the leached copper ore?

In the metallurgy of aluminium, purified Al₂O₃ is mixed with