Electrometallurgy is used for

In the metallurgy of copper,metallic copper is finally formed in the furnace by the reactions:

The 'Hydrometallurgy' process is used for the extraction of which metals?

Although carbon and hydrogen are better reducing agents,they are not used to reduce metallic oxides at high temperatures. Why?

During the extraction of gold,the following reactions take place: $4Au + 8CN^{-} + 2H_2O + O_2 \longrightarrow 4[Au(CN)_2]^{-} + 4OH^{-}$ and $2[Au(CN)_2]^{-} + Zn \longrightarrow [Zn(CN)_4]^{2-} + 2Au$. $X$ and $Y$ are respectively:

In the Hall-Heroult process,which of the following is used for reducing $Al_2O_3$?