1.

Give an example of a sulphide ore which is reduced to metal by heating alone, i.e.,by roasting

Answer»

Cinnabar (HgS) on roasting is first changed to mercuric oxide which on further heating is reduced to mcrcury.
2HgS(s) + 3O2(g)  +Heat  ---->2HgO(s) +      2SO2(g)
                2HgO(s)+Heat    ----> 2Hg(l) +O2(g)



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