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  4. Extraction of mercury from cinnabar is achieved by

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Q. Extraction of mercury from cinnabar is achieved by

J & K CETJ & K CET 2015The d-and f-Block Elements

Solution:

Mercury can be obtained from cinnabar $HgS$ by heating the cinnabar ore in current of air and condensing the mercury vapour formed. Due to its relatively low boiling point, mercury can be easily purified by vaccum distillation.
$HgS + O _{2} \rightarrow Hg + SO _{2} \uparrow$