Calcination is the process of heating the ore:

Choose the correct code regarding the Roasting process.
$I$. It is the process of heating ore in air to obtain the oxide.
$II$. It is an exothermic process.
$III$. It is used for hydrated oxide and oxysalt ore.
$IV$. It is used after the concentration of ore.

When limestone is heated,$CO_{2}$ is given off. The metallurgical operation is

Which statement is correct for roasting?

The major products of the following reaction,$2ZnS_{(s)} + 3O_{2(g)} \xrightarrow{\text{Heat}} \dots$ are

Roasting of copper pyrites ores is for the following purposes: