In the manufacture of iron,limestone is added to the blast furnace. The calcium ion ends up in the form of:

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

In the extraction of copper from copper glance,blister copper is formed by the evolution of gas $\underline{X}$. The shape of the molecule of $\underline{X}$ is

In the process of leaching of gold by cyanide,what are the complexes $X$ and $Y$ respectively?
$4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \to 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$
$2[Au(CN)_2]^-(aq) + Zn(s) \to [Zn(CN)_4]^{2-}(aq) + 2Au(s)$
$X$ and $Y$ are:

Out of $C$ and $CO$,which is a better reducing agent for $ZnO$?

In the process of extraction of gold,roasted gold ore reacts as follows. Identify the complexes $[X]$ and $[Y]$:
$\text{Roasted gold ore} + CN^{-} + H_2O \xrightarrow{O_2} [X] + OH^{-}$
$[X] + Zn \to [Y] + Au$