Write the chemical equation for the following
Cinnabar is roasted in a furnace.

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Solution

Cinnabar $(HgS)$ is an ore of Mercury.
Mercury $(Hg)$ is a less reactive metal and therefore it can be extracted upon heating.
Least reactive metals can be extracted or obtained upon heating.
The chemical reaction of Cinnabar when roasted in a furnace involves the formation of pure Mercury.
The chemical reaction occurs as follows:
$\underset{(Cinnabar)}{HgS (s)} + O_{2} (g) + Heat \underset{- {SO}_{2}}{\to} 2 HgO \overset{Heat}{\to} 2 \underset{Mercury}{Hg} + O_{2}$

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