Question

Sulphide ore of a metal is first converted to its oxide t
o extract the metal from it

Answer 1

It is true that sulphide ores are converted to oxides prior to their extraction. It is so because extracting a metal from its oxide is easier than extracting it from its sulphide and carbonate ores.
The process of conversion of sulphide to oxide ores is called roasting.
Hope it helps you