(i) Ore A is a carbonate ore.
The steps involved in extraction of A are:
(a) Calcination The carbonate ore is heated strongly in the limited supply of air to produce metal oxide.
(b) Reduction to metal The oxide ore is reduced with C (coke).
(ii) Ore B is a sulphide ore.
Following steps are involved in its extraction:
(a) Roasting The sulphide ore is heated strongly in the presence of excess of air to produce metal oxide.
(b) Reduction Oxide of metal B is reduced by carbon to obtain the corresponding metal.