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What is cinnbar ? How is a metal extract...

What is cinnbar ? How is a metal extracted from cinnabar ? Explain briefly.

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Cinnabar is hgS
Mercury is obtained by roasting Cinnabar. HgO formed is thermally unstable and gives Mercury.
`2HgS(s)+O_(2)(g)toHgO(s)+SO_(2)(g)`
`2HgO(s)overset("Heat")(to)Hg(1)+O_(2)(g)`
Mercury can be purified by distillation.
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