Q. 60 C4.4( 5 Votes )

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

Answer :

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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