In the cyanide process for the extraction of silver,sodium cyanide $(NaCN)$ is used to

In Hall’s process,the main reagent is mixed with

Heating with carbon in absence of air is known as:

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

The slag obtained during the extraction of copper from copper pyrites is composed mainly of

The temperature of the slag zone in the metallurgy of iron using a blast furnace is: