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 reactions involved. 

Explanation

The metal is mercury (Hg) because it is the only metal which exists in liquid state. Mercury is obtained from the sulphide are called Cinnabar ore (HgS).
The reactions involved are
`underset("Mercury (II) sulphide (Cinnabar above)")(2HgS(s))+underset("Oxygen (from air)")(3O_(2)(g))overset("Roasting")tounderset("Mercury (II) oxide")(2HgO(s))+underset("Suphur dioxide")(2SO_(4)(g))`
`underset("Mercury (II) oxide (formed above)")(2HgO(s))underset("reduction")overset("Heat")tounderset("Mercury metal")(2Hg(l))+O_(2)(g)`