A) heating it in air
B) electrolytic reduction
C) roasting followed by reduction with carbon
D) roasting followed by reduction with another metal
Correct Answer: A
Solution :
Mercury can be obtained from cinnabar \[\text{HgS}\]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. \[HgS+{{O}_{2}}\xrightarrow{{}}Hg+S{{O}_{2}}\uparrow \]
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