Answer:
(a, b)
In the metallurgical
process, the oxide ores are reduced by carbon. Sulphide ore cannot be reduced
by carbon. Here, haematite () and calamine () are oxide ores of iron and
zinc
respectively while iron pyrites (FeS2) and Sphalerite () are sulphide ores of iron and
zinc
respectively.
Therefore, haematite
and calamine can be reduced by carbon.
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