Aluminium is used as a reducing agent in the reduction of

Matte is a mixture of .......... .

$Pb$ and $Sn$ are extracted from their chief ores by:

In the alumino-thermite process,the ignition mixture is a mixture of ..........

In the process of extraction of gold,roasted gold ore reacts as follows. Identify the complexes $[X]$ and $[Y]$:
$\text{Roasted gold ore} + CN^{-} + H_2O \xrightarrow{O_2} [X] + OH^{-}$
$[X] + Zn \to [Y] + Au$

In the extraction of copper,metal is formed in the Bessemer converter due to the reaction: