Question

An ore gives ${\mathrm{SO}}_2$ on heating. Name the method to enrich this one?

Answer 1

1. Ore

An ore is a mineral of a metal that has the metal in a certain form and a quantity. It is used in the commercial production of metal.
2. Reaction of Zinc blende with Oxygen

The ore which gives Sulphur dioxide $\left({\mathrm{SO}}_2\right)$ on heating is called Zinc blende (ZnS) and the reaction is given below:

$$\begin{gathered} 2\mathrm{ZnS}\left(\mathrm{s}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{\mathrm{heat}}{\to }2\mathrm{ZnO}\left(\mathrm{s}\right)+2{\mathrm{SO}}_2\left(\mathrm{s}\right) \\ \left(\mathrm{Zinc}\mathrm{blende}\right)\left(\mathrm{Oxygen}\right)\left(\mathrm{Zinc}\mathrm{oxide}\right)\left(\mathrm{Sulphur}\mathrm{dioxide}\right) \end{gathered}$$

3. Roasting

The sulphide ores are concentrated using the roasting method.

Roasting is the process of concentrating ore in the presence of an excess of air. Zinc blende (ZnS) can be heated in the presence of an excess of air to give Zinc oxide (ZnO) and Sulphur oxide $\left({\mathrm{SO}}_2\right)$.