Question

Describe the extraction of mercury metal from its ore cinnabar

Answer 1

Extraction of mercury metal: 
Cinnabar (HgS) is first heated in air. This turns HgS [mercury sulphide or cinnabar] into HgO (mercury oxide); by liberation of sulphur dioxide.
Mercury oxide so obtained is again heated strongly. This reduces mercury oxide to mercury metal.
2HgS + 3O2 ⇨ 2HgO + 2SO2
2HgO ⇨ 2Hg + O2

Answer 2

HgS (Cinnabar)

These sulphide ores can be converted to oxide ores by Roasting i.e. heating it in access of air

HgS + O2------------) HgO + SO2

This Oxide can be reduced to metal by further heating.

HgO + heat -----------) Hg +O2

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