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How is mercury extracted from cinnabar?...

How is mercury extracted from cinnabar?

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Cinnabar is roasted in excess of air, then mercury is obtained.
`underset("Cinnabar")(2HgS) +3O_(2) to 2Hg +2SO_(2)uarr`
`2HgO +HgS to 3Hg +SO_(2) uarr`
`2HgO overset(Delta)to underset("Mercury")(2Hg) +O_(2)uarr`
In this process, no external reducing agent is used and hence, called as auto reduction.
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