Cryolite $(Na_3AlF_6)$ helps in:

Identify $A$ and $B$ respectively in the following reactions:
$4 Au_{(s)} + 8 CN^{-}_{(aq)} + 2 H_2O_{(aq)} + O_{2(g)} \longrightarrow 4 A_{(aq)} + 4 OH^{-}_{(aq)}$
$2 A_{(aq)} + Zn_{(s)} \longrightarrow B_{(aq)} + 2 Au_{(s)}$

What is the reduction of $Cr_2O_3$ by heating it with aluminum called?

The Ellingham diagram is a plot between:

Copper matte is a mixture of

$A$ complex is formed in the extraction of which of the following metals?