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

Formation of metallic copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reactions?

The cyanide process of gold extraction involves leaching out gold from its ore with $CN^{-}$ in the presence of $Q$ in water to form $R$. Subsequently,$R$ is treated with $T$ to obtain $Au$ and $Z$. Choose the correct option$(s)$.
$1$. $T$ is $Zn$
$2$. $R$ is $[Au(CN)_2]^-$
$3$. $Z$ is $[Zn(CN)_4]^{2-}$
$4$. $Q$ is $O_2$

State the important features of Ellingham diagram. Also state its limitations.

The materials mixed with the ore before it is subjected to smelting in the extraction of iron are:

In the alumino-thermite process,$Al$ acts as which of the following substances?