Question

how should metal sulphides and carbonates be converted to metal oxide in the extraction of metals? name the process involved in the conversion. write the equation for each process

Answer 1

Metal sulphides should be strongly heated in presence of Oxygen , this process is called roasting . Metal carbonates should be heated in absence of Oxygen , this process is called calcination.

Answer 2

sulphide ore
sulphide ore can be converted into an oxide for by burning the ore at high temperature within the presence of oxygen this process is called as roasting
ZnS +02---------ZnO +SO2
carbonate ores
carbonate ore can be converted to its oxide by burning the ore at limited amount of oxygen this process is called as calcination 
ZnCO3 -----------ZnO +CO2