Copper matte contains

Impure silver ore $+ CN^{-} + H_2O \xrightarrow{O_2} [X]^{-} + OH^{-}$
$[X]^{-} + Zn \longrightarrow [Y]^{2-} + Ag \text{ (pure)}$
The coordination numbers of the metals in $[X]$ and $[Y]$ are respectively

Explain the Hall-Heroult process.

In the alumino-thermite process,$Al$ acts as

Describe the reaction occurring in the blast furnace at the lower temperature range.

Self-reduction process is used in the extraction of $-$