During the smelting of roasted copper ore,silica is added to remove:

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

In metallurgy,aluminum acts as a .....

The purpose of smelting an ore is to.......

What is the role of the graphite rod in the electrometallurgy of aluminium?

Which among the following processes occurs at $1500 \ K$ in a blast furnace for the extraction of iron?