The process of heating an ore strongly in the presence of air to convert it into its oxide is known as:
Correct: B
Roasting is the process of heating a sulphide ore strongly in the presence of excess air below its melting point. This converts the sulphide ore into its corresponding metal oxide and releases sulphur dioxide gas. Calcination, on the other hand, involves heating a carbonate or hydrate ore strongly in the absence or limited supply of air to convert it into its oxide.