Roasting and Calcination

The major products of the following reaction, $ZnS\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{\mathrm{heat}}{⟶}$, are:

$$Identify the correct statement about $\left[\mathrm{X}\right]$.

$\left[\mathrm{X}\right]={\mathrm{CuCO}}_3.\mathrm{Cu}{\left(\mathrm{OH}\right)}_2$

When ${\mathrm{Cu}}^{2+}$ion is treated with $\mathrm{KI}$, a white precipitate is formed. The white precipitate $\left(\mathrm{P}\right)$ is of?

Which of the following changes is not observed when an ore is heated during calcination?