Calcination is the process of heating the ore :

Consider two chemical reactions $(A)$ and $(B)$ that take place during metallurgical processes:
$(A)$ $ZnCO_{3(s)} \longrightarrow ZnO_{(s)} + CO_{2(g)}$
$(B)$ $2ZnS_{(s)} + 3O_{2(g)} \longrightarrow 2ZnO_{(s)} + 2SO_{2(g)}$
The correct names for these processes are:

Which of the following reactions is an example of the calcination process?

The mixture obtained from the roasting of copper pyrites is ......... .

Which statement is correct for roasting?

Why are sulphide ores converted to oxide before reduction?