Q60 of 400 Page 193

Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.

Mercury (II) Sulphide ore is roasted in air to form mercury (II) oxide.

2HgS(s) + 3O2(g) -> 2HgO(s) + 2SO2(g)


Then, Mercury (II) Oxide is heated to about 300oC and it undergoes decomposition to form mercury metal.



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