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

The process that involves the removal of sulphur from the ores is

Which reaction is not possible for calcination?

In metallurgy,select the correct option using $T$ (True) or $F$ (False) for the statements given regarding calcination:
$(1)$ It is used to remove moisture.
$(2)$ It is used to decompose carbonates.
$(3)$ It is used to remove volatile impurities.

The main function of roasting is

Which of the following sulphides,when heated strongly in air,gives the corresponding metal?