Extraction of gold and silver involves leaching the metal with $CN^{-}$ ion. The metal is recovered by . . . . . .

Case hardening is a process of heating steel in an atmosphere of:

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

Is it true that under certain conditions,$Mg$ can reduce $Al_2O_3$ and $Al$ can reduce $MgO$? What are those conditions?

In the metallurgy of copper,metallic copper is finally formed in the furnace by the reactions:

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 $\Delta G^{\ominus}$.