Identify the reaction that does not take place during the smelting process of copper extraction.

Smelting is carried out in a ...... .

Observe the following statements:
Statement-$I$: The choice of reducing agent for the reduction of an oxide ore can be predicted by using Ellingham diagram,a plot of $\Delta G^{\ominus}$ vs $T$.
Statement-$II$: According to Ellingham diagram,metal oxide with higher $\Delta G^{\ominus}$ is more stable than the oxide with lower $\Delta G^{\ominus}$.

During the extraction of sodium metal by electrolysis,a mixture of $40\%$ molten $NaCl$ and $60\%$ $CaCl_2$ is used because .......

Write down the reactions taking place in the blast furnace related to the metallurgy of iron in the temperature range $500-800 \ K$.

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 $O_2$