The sulphide ores are converted into oxides by heating strongly in the presence of excess air. The process is known as:

Correct option is B

The correct answer is roasting.

Information Booster:

• In this roasting process, the ores are generally converted into​ Metal oxides.
• It is the process in which ore is converted into its oxide by heating it strongly in excess of air.
• This method is commonly used for sulfide ores.
• During the roasting process, moisture and non-metallic impurities are removed as volatile gases.
• For example, Zinc sulfide is converted into zinc oxide by roasting.