A metal that exists as a liquid at room temperature is obtained by heating its sulfide in the presence of air. Identify the metal and its ore and give the reaction involved.

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Solution

Mercury:
Most metals are solid at room temperature but Mercury $(Hg)$ is the only metal that is liquid at room temperature.
It can be obtained by heating cinnabar or Mercury(II) sulfide $(HgS)$ .
Reaction of cinnabar with oxygen:
When cinnabar $(HgS)$ is heated in presence of atmospheric oxygen $(O_{2})$ then Mercury(II) oxide $(HgO)$ and Sulfur dioxide $({SO}_{2})$ are formed. Then further mercury oxide is heated and elemental mercury $(Hg)$ is obtained.
The chemical reaction can be depicted as:
$2 HgS (s) + 3 O_{2} (g) \overset{∆}{\to} 2 HgO (s) + 2 {SO}_{2} (g) 2 HgO (s) \overset{∆}{\to} 2 Hg (l) + O_{2} (g)$

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