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

Mercury is the metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air.  

Cinnabar is the ore of mercury.

Reaction: 2HgS + 3O₂→ 2HgO + 2SO₂