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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 an ore of mercury, chemically it is HgS.
The concentrated ore is subjected to roasting where the metal sulphide is reduced to the metal in the presence of air.
`2HgS+O_(2)to2HgO+2S`.
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