Which option gives the process of extraction of mercury from its ore cinnabar?

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Cooling cinnabar in the presence of excess air

Cooling the cinnabar to convert it into mercuric oxide and then heating it

Convert the cinnabar into mercuric oxide and then heat it again

Heating cinnabar in the presence of limited air and then adding a small amount of water

answer is C.

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Detailed Solution

The process of extraction of mercury from its ore cinnabar is to convert it into mercuric oxide and then heat it again.

$HgS + O_{2} \to HgO + {SO}_{2} \overset{∆}{\to} Hg$

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